Best hiking fleeces UK 2026: grid, midweight, warm fleece and technical picks

Most people think of the fleece as the boring middle layer, the thing between the base layer they fuss over and the waterproof they spend real money on. That is a mistake. The fleece is the layer that does the actual temperature management on a hike: it traps the warm air your body makes, keeps working when it is damp, and lets sweat pass through so you are not soaked from the inside on a climb. Get it right and you barely think about it. Get it wrong and you spend the day either boiling on the up or shivering at the top.

The trouble is that "fleece" covers half a dozen very different things, from a thin grid layer you wear moving hard to a plush high-loft jacket that is really a warm layer for when you stop. So this guide is built around type, not brand. Lightweight grid and active fleeces, everyday midweight cosy fleeces, high-loft warm fleeces, technical hooded fleeces and softshell hybrids, with an honest note on who each one is for and where it sits in a layering system.

Two of these I own and wear. The Arc'teryx Delta Hoody is my most-worn layer of the last couple of years, a superlight grid fleece I live in and am taking to Finland this winter as the indoor and travel layer. The ThruDark Phalanx is the warm fleece I reach for when it is properly cold and I am moving slowly. The rest are chosen on fabric, weight, fit and how each piece earns its place in a layering system. This is the hub for our whole fleece cluster, so where a piece has its own full review I have linked down to it.

Every fleece in this guide, compared

The main picks in one table. Tap a name to jump to the write-up, or the buy button to check today's price.

What fleece type for what use

Before you look at any single product, work out which of these you actually need. Most people buy the wrong type, not the wrong brand.

Lightweight grid or active fleece. Thin, breathable, cut close, worn while you are moving and making your own heat. This is the fleece for uphill work, for three-season UK hiking, and as the layer that lives on under a shell. It is not a "warm" fleece and it is not meant to be. If you only buy one fleece for general hiking, buy this type.

Everyday midweight cosy fleece. The classic full-zip fleece: warm, soft, not especially technical, brilliant round camp, on the school run, in the car and on gentle walks. Heavier for the warmth it gives than a technical fleece, and it can feel like too much on a hard climb, but hard to beat for comfort and value.

High-loft warm fleece. Plush, deep-pile fabric that traps a lot of air and gives you real warmth for standing still: cold belays, slow winter walks, camp on a frosty night, or as a warm midlayer under a shell in deep cold. This is the true "warm fleece", and it is a different job from a grid fleece. Do not ask one piece to do both.

Technical hooded fleece. Slim, athletic, hooded, built for fast-moving mountain days where a helmet-friendly hood and a low-bulk cut matter. Usually grid or striped fabrics with a bit of stretch and sometimes softshell panels.

Softshell-hybrid fleece. A fleece with a wind-resistant membrane or face, so it works as an outer layer on cold, dry, windy days without a shell over the top. Warmer and less breathable than a plain fleece, and it loses the pack-inside-a-shell versatility, but very comfortable as standalone kit.

Grid vs high-loft: the split that matters most

If you take one idea from this guide, take this one. Fleeces fall into two broad camps, and they do opposite jobs.

Grid fleece has a waffle or grid pattern on the inside. The raised bits trap warm air and touch your skin; the channels between them let sweat and heat escape. That makes grid fleece breathe far better than solid fleece, so you can keep it on while working hard without cooking. It is light, it dries fast, and it is the fabric to want for anything where you are moving and sweating. What it is not is warm when you stand still, because breathability and standing-still warmth pull in opposite directions.

High-loft fleece is thick, plush, deep-pile fabric that traps a big volume of still air. That air is the warmth. It is the fabric you want when you are cold and not making much heat: at the top, at camp, on a slow walk. The trade-off is that it does not breathe as freely and it packs bigger, so it is the wrong thing to grind uphill in.

The mistake I see most is people buying a plush high-loft fleece as their one hiking fleece, then overheating on every climb. For general moving-around hiking, a grid fleece is the smarter single buy. Add a high-loft warm fleece as a second piece if you feel the cold when you stop. Standard 200-weight fleece sits in the middle: cosy and cheap, but heavier for its warmth than either specialist.

Fabric tech: Power Grid, Power Stretch, Thermal Pro, Alpha

You will see the same fabric names again and again, most of them from Polartec, who make the fabric that a lot of brands then cut and sew. Here is what the important ones actually mean, so the spec sheets stop being noise.

Polartec Power Grid is the classic grid fleece: light, breathable, quick-drying, with that waffle inner face. It is the benchmark active-fleece fabric and what Patagonia's R1 and the Mountain Hardwear Summit Grid are built from. This is the "worn moving" fabric.

Polartec Power Stretch (and Power Stretch Pro) is a close-fitting, four-way-stretch fleece with a smoother, more abrasion-resistant outer face. Power Stretch Pro adds a tougher nylon-rich surface that shrugs off pack straps and rock. Warmer and more wind-resistant than open grid, less breathable, brilliant as a slim technical layer. The Mammut Aconcagua uses it.

Polartec Thermal Pro (and Thermal Pro High Loft) is the warmth-to-weight family. The High Loft version uses long, lofted yarns to trap a lot of air for very little weight, which is why it turns up in packable warm fleeces like the Montane Protium and the ThruDark Phalanx. This is a "warm fleece" fabric.

Polartec Alpha is active insulation rather than a plain fleece: a lofted fibre held in an open structure so it insulates like a light puffy but breathes like a fleece. It is the fabric for people who run hot and hate stopping to add and remove layers. It sits at the edge of this guide's remit, on the fleece side of the line rather than the down-jacket side.

Brands who do not use Polartec often run their own equivalents. Rab's Thermic G is their grid fleece, Thermic S a striped high-and-low-loft fabric, and Columbia's MTR filament is a solid everyday fleece. The names change; the two questions do not. Is it grid or high-loft, and how heavy is it.

Where a fleece sits in the layering system

A fleece is the middle of three layers, and it only works if the other two are doing their jobs. Underneath sits a base layer that moves sweat off your skin, so the fleece is not trying to wick from wet skin directly. Over the top, when it rains or the wind gets up, goes a waterproof shell that stops the weather while letting the fleece keep breathing.

The fleece's own job is warmth and moisture transport: trap the heat your body makes, and pass sweat outward toward the shell so it can escape. That is why breathability matters so much in a fleece you wear moving, and why a grid fabric beats a solid one for active use.

In deep cold the fleece is one part of the stack, not the whole answer. Below a certain temperature you stop relying on a fleece for standing-still warmth and add a proper insulated layer over the top: that is the job of a down or synthetic puffy, which we cover in the down jacket guide. A high-loft warm fleece bridges the gap, but it is not a substitute for a puffy when it is truly cold and you are still. Think of it as base layer for moisture, fleece for active warmth, puffy for standing-still warmth, shell for weather. Each piece has a lane.

The best hiking fleeces UK 2026

Sorted by type. Every pick says which type it is and who it suits. Where I own the piece I have said so; everything else is a buyer's assessment based on fabric, weight and reviews, and every spec here has been checked against the maker's own figures.

Lightweight grid and active fleeces

The type most hikers should buy first: breathable layers you wear on the move, from thin grid fleeces to warmer active insulation.

Salomon Thernova Fleece Hoodie: the best all-round midlayer

Active insulation. Best overall. This is the one I would point most UK hikers at first, and it is not a plain fleece. The Thernova is built around PrimaLoft active insulation, a light synthetic fill that traps warmth like a fleece but keeps breathing when you work, so it covers a wider slice of the day than a pure grid: warm enough for cold starts and short stops, still airy enough to keep on when the path tilts up. That range is what most people actually want from one midlayer on a changeable UK hill day. It comes in at around £110, sensible for the fabric and finish, in several colours across men's and women's cuts. One thing to be straight about: Salomon is one of the few brands here we earn a commission on, so I have judged it on the fabric and the reviews rather than the payout, and I rate it on merit. This is a researched assessment, not a piece I have lived in yet. Full detail in the Salomon Thernova review.

Rab Nexus Pull-On: the best grid fleece

Lightweight grid. If you want a pure grid fleece, the thin, breathable kind you wear moving, this is where I would start. The Nexus Pull-On uses Rab's Thermic G grid fleece, weighs around 252g in a medium, and is built as a versatile midlayer for exactly the changeable, stop-start days most of us actually walk: warm enough to matter, breathable enough to keep on when the path tilts up, with a deep venting half-zip to dump heat fast and a slim, low-bulk cut that layers cleanly under a shell. It is not a warm fleece and it is not trying to be. It is the do-everything grid, and at around £75 it is sensibly priced for the fabric. Our full Rab Nexus review has the detail.

Arc'teryx Delta Hoody: the superlight grid I live in

Lightweight grid. I own this one. This is my most-worn layer of the last couple of years, so I can talk about it properly. It is built from Polartec Classic 100 micro-grid velour, a featherlight 152gsm fabric, and it is superlight in a way the numbers do not quite convey: it disappears on, breathes brilliantly on the move, and it is soft enough that I wear it as a normal top as much as hiking kit. It gets comments, which is not why you buy a fleece, but it is a nicely made thing. It is warm for its weight rather than warm full stop, so it is a moving layer and a travel layer, not a standing-still one. It is coming to Finland with me this winter as the indoor and airport layer, and I am recommending it purely because it has earned its place. Full write-up in the Arc'teryx Delta Hoody review.

Patagonia R1 Air: the benchmark active fleece

Lightweight grid. No fleece guide is honest without the R1 in it. Patagonia's R1, and the newer R1 Air, is the piece the entire active-fleece category is measured against: Polartec Power Grid (an airy hollow-core knit on the Air version) that gives an outstanding warmth-to-weight ratio while venting heat and sweat through the grid channels, so you can climb hard in it and not cook. It is a moving layer, not a warm one, and it is not cheap at around £145 to £160. But if you want the reference-standard grid fleece and can find your size, it is the one everything else is chasing, and Tiso stock it in the UK.

Mountain Hardwear Summit Grid Hoody: the best-value grid hoody

Lightweight grid, hooded. If the R1's price makes you wince, this is the grid hoody I would point you at. It uses Polartec Power Grid, the same benchmark fabric family, in a hooded pullover cut that reviewers consistently rate, and at around 310g it is light enough to pack and forget. At roughly £100 it gives you the proper active-fleece experience, helmet-friendly hood and all, for meaningfully less than the boutique names. On the specs and the reviews it is the value pick of the technical grid fleeces, and my best-value grid choice here.

Mountain Equipment Lumiko Hoody: the packable recycled grid

Lightweight grid, hooded. A likeable British-brand grid hoody built from a recycled stretch grid fabric, cut slim and packable, at around £70. On paper it does the same job as the pieces above, a breathable moving layer with a bit of stretch and a hood, at a friendlier price, and Mountain Equipment have a long record of making solid, unfussy hill kit. It is a sensible, affordable UK grid option worth having on the shortlist.

Everyday and midweight cosy fleeces

The classic warm-and-soft full-zip fleece. Comfort and value, not cutting-edge fabric.

Columbia Steens Mountain: the best budget fleece

Midweight cosy. The sensible cheap fleece, and a deserved best-seller. It is a 100% polyester MTR filament fleece at around 250gsm, a plain solid fleece rather than a technical grid, full-zip, soft and warm and easy to live in. At around £50 it is the one I would hand someone who wants a warm, comfortable fleece for dog walks, camp, the car and gentle hikes and does not need the fabric to breathe on a hard climb. It is heavier for its warmth than a technical fleece and it is not a moving-hard layer, but as a warm everyday fleece for the money it is very hard to beat. Our Columbia Steens Mountain review covers it in full.

Craghoppers CO2 Renu Half Zip: the best value fleece

Midweight value. My best-value pick, and the one with the best story behind the fabric. The CO2 Renu is a soft microfleece made partly from carbon-capture yarn, where waste carbon is turned into polyester fibre, blended with recycled polyester, an approach that won Craghoppers an ISPO award. In use it is a straightforward soft half-zip fleece with twin zipped pockets, warm and comfortable, and it turns up regularly around the £40 mark, sometimes less. It is an everyday midweight rather than a technical piece, but pound for pound it is the most fleece here, and the greenest. Full detail in the Craghoppers CO2 Renu review.

Berghaus Prism InterActive: the British everyday staple

Midweight cosy. A proper British-hill staple, and a clever one if you already wear Berghaus. The Prism is a Polartec Classic fleece, soft and warm with a good warmth-to-weight for a solid fleece, at around 430g in a large and roughly £70. Its party trick is the InterActive zip, which lets it zip inside a compatible Berghaus waterproof so the two work as one system. It is a solid fleece, not a grid, so it is a wear-it-around and layer-up piece rather than a hard-climbing one, but as a dependable everyday fleece it is a safe buy.

Salomon Essential Lightwarm: the light everyday Salomon midlayer

Lightweight everyday. Salomon's simplest fleece, and a sensible everyday pick now we earn on the brand. The Essential Lightwarm is a full-zip midlayer in a light, stretchy, quick-drying fleece with a chin guard, at around 286g and a friendly price from about £72. It is a warm-but-light layer for everyday wear and milder days rather than a technical climbing fleece, and it comes in several colours across men's and women's cuts. Buyable direct from Salomon.

Salomon Chroma Half Zip: the cosy Salomon half-zip

Midweight cosy. A softer, warmer Salomon option than the Essential. The Chroma is a half-zip fleece with a double fleece lining, stretch side panels and a kangaroo pocket, at around 300g with a medium warmth level, and it lists at about £120 though it is often discounted. It is a comfortable everyday and layering fleece rather than a fast-and-light one, and Salomon offers it in a range of colours. Buyable direct from Salomon.

Patagonia Better Sweater: the iconic everyday fleece

Midweight cosy. The fleece that launched a thousand car-park photos, and better than its lifestyle reputation suggests. The Better Sweater is a dense, sweater-knit fleece that looks smart enough for the pub and is warm when you are standing still, which is exactly why it is not a climbing layer: that dense knit does not breathe well, so you will overheat grinding uphill in it. As an everyday and around-camp warm layer at around £150 to £170 it is lovely, hard-wearing and endlessly re-bought. So this is a simple recommendation: buy it as a comfortable everyday fleece, not as an active hiking one.

High-loft warm fleeces

The true warm fleece. Plush high-pile fabric for cold, low-output days: the top of the climb, slow winter walks, camp on a frosty night, or a warm midlayer under a shell. If what you actually want is warmth when you stop moving, this is your section, not the grid fleeces above.

The North Face Denali: the warm fleece icon

High-loft warm fleece. My best warm-fleece pick. If there is an archetypal warm fleece, this is it. The Denali is built from heavyweight Polartec 300 fleece with abrasion-resistant nylon reinforcing panels across the shoulders and forearms, and it has been the warm-fleece benchmark for the better part of thirty years. It is plush, properly warm and tough, the fleece to pull on when it is cold and you are not making much heat: at the summit, standing around, or as a warm midlayer under a shell in real cold. It is heavy and it does not breathe like a grid fleece, so it is not a hard-climbing layer, and at around £160 to £200 it is not cheap. But as a warm fleece that will outlast most of your other kit, it earns it. Full assessment in the North Face Denali review.

Montane Protium Hoody: the packable warm fleece

High-loft warm fleece. The warm fleece for people who care about weight and packed size. The Protium (the XPD hooded version) is built from recycled Polartec Thermal Pro High Loft, the warmth-to-weight king of the Polartec fleece family, which uses long lofted yarns to trap a lot of air for very little fabric. The men's XPD comes in around 470g and packs down small for the warmth it gives, so it is a warm layer you can actually carry all day and pull on when you stop. At around £90 to £160 depending on version and sale, it is the high-loft pick I would take if I were counting grams. Our Montane Protium review has the full picture.

ThruDark Phalanx: the burly warm fleece I own

High-loft warm fleece. I own this one. This is the warm fleece I actually reach for when it is cold and I am moving slowly, so I can speak to it. It is built from Polartec High Loft, the warmest-for-weight Polartec fleece, with a clever open-mesh stitch construction that vents excess heat so it does not become a sauna the moment you start working, plus elasticated cuffs and hem that keep the warm air in and four zipped pockets. It is a substantial piece at around 575g in a large, and it is properly warm. It is not cheap at around £180. I bought it, I wear it, and it is very good. Full write-up in the ThruDark Phalanx review.

Rab Superflux Hoody: the warmth-to-weight value pick

High-loft warm fleece. Rab's high-loft warm fleece, using their Thermic high-loft fabric for warmth-to-weight, and usually the cheapest way into a proper warm fleece at around £70 to £100. On the specs it does the same job as the Protium, a packable, warm, high-loft midlayer for cold and low-output days, at a friendlier price, and Rab's fleece fabrics are consistently well regarded. If the Denali is too dear and you want a warm fleece that still packs, it is the value option worth checking.

Patagonia R2 / R3 Regulator: the warmest technical fleece

High-loft warm fleece. If you want the most technical warm fleece rather than the plushest lifestyle one, this is it. Patagonia's R2 and warmer R3 use high-loft Polartec grid-backed fabric to give serious warmth in a still-breathable, still-fairly-light package, the warm end of Patagonia's Regulator system that starts with the R1. At around £180 to £220 it is expensive, but for a warm fleece that still moves and breathes better than a solid high-pile fleece, it is the technical benchmark. Overkill for gentle UK hills, in its element on a cold alpine or winter day.

Technical hooded fleeces

Slim, athletic, hooded fleeces for fast-moving mountain days, where a helmet-friendly hood and low bulk matter.

Rab Ascendor Light Hoody: the best technical fleece

Technical hooded. My best technical pick. A top-rated lightweight alpine fleece, and the one I would take for fast-moving mountain days. It uses Rab's Thermic S fabric, a 165gsm striped fleece with alternating high- and low-lofting stripes so it insulates and breathes while staying low-bulk, with stretchy softshell panels in the higher-wear areas and a slim, athletic cut. At around 308g in a medium and roughly £130 it is light, close-fitting and built to move, with a hood that works under a helmet. It is not a warm fleece for standing still; it is a moving-fast layer for people who cover ground. Assessed on specs and the strong reviews it consistently earns.

Mammut Aconcagua Light: the tough technical stretch fleece

Technical stretch fleece. The pick for scrambling, mountaineering and anything that drags a fleece across rock. The Aconcagua Light uses Polartec Power Stretch Pro, a close-fitting four-way-stretch fleece with a smooth, abrasion-resistant nylon face that shrugs off pack straps and scree, at around 375g with a slim Euro fit and harness-friendly pockets. It is warmer and more wind-resistant than an open grid fleece and tougher on the outside, at the cost of some breathability, which makes it a great slim active layer for technical days. At around £120 to £135 it is priced like the quality fabric it is. Full detail in the Mammut Aconcagua review.

Lightweight everyday fleeces

A light, stretchy fleece for everyday wear and milder days, the kind you pull on without thinking about it.

Jack Wolfskin Taunus: the light everyday fleece

Lightweight everyday fleece. Not everything needs to be a technical piece. The Taunus is a straightforward full-zip fleece made from recycled Polartec 100 Series fabric, with a smooth face and a bit of stretch, so it layers easily under a shell and works on its own around town or on milder days. It is light and breathable rather than warm, so treat it as an everyday and shoulder-season layer rather than your cold-day fleece. At around £50 to £70 it is honest value from a well-known brand. One thing to be clear on: this is a plain fleece, not a windproof one, so wind blows through it like any other. If you specifically want a fleece you can wear as a wind-beating outer layer, look for one that lists a Polartec Windbloc or Wind Pro membrane in its spec.

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