Hiking socks: the complete UK buying guide

How to choose hiking socks

A hiking sock has one job: keep your foot dry and friction-free for as long as you are on your feet. Get the material, cushioning, height and fit right and blisters mostly take care of themselves. Get any one of them wrong and the best boots in the world will not save you.

Work through the decisions in order of importance. Material first, then cushioning for the season and distance, then height to suit your footwear, then fit. Everything below breaks each of those down.

Merino wool vs synthetic

Merino wool, almost always blended with nylon and a little elastane for durability and stretch, is the default choice for UK walking. It regulates temperature across a wide range, resists odour naturally over consecutive days, and keeps managing moisture even when damp, which matters when your feet sweat inside waterproof boots. A good blend sits around 50-70% merino: too little and you lose the temperature control, too much and the sock wears out quickly.

Synthetic socks (nylon, polyester, sometimes with Coolmax) dry faster, tend to cost less and are hard-wearing. The trade-off is that they hold odour and can feel clammy once saturated. For single day walks where you wash them the same night, synthetic is a sensible budget option. For multi-day trips, cold weather or blister-prone feet, merino is worth the extra outlay.

Why cotton socks cause blisters

Cotton is the one material to avoid entirely. It absorbs moisture and holds it against the skin rather than wicking it away, so your feet stay wet all day. Wet skin softens, and soft skin tears and rubs far more easily than dry skin, which is exactly how a hot spot turns into a blister.

Cotton also loses all insulation once damp, so feet get cold in wet British conditions. On a short stroll in the dry it matters little, but for any real distance a proper merino or synthetic sock makes an obvious difference.

Cushioning weight: light, mid and heavy

Cushioning describes how much padding, and therefore warmth and thickness, a sock has. More is not automatically better: too much bulk tightens the fit inside the boot and can increase rubbing, so match the weight to the season, distance and your footwear volume.

Light or no cushion suits warm weather, trail shoes and fast days, prioritising breathability over padding. Mid cushion is the all-rounder for hiking boots and full days out, adding protection under the heel and ball of the foot with enough warmth for spring, autumn and mild winter walks. Heavy cushion is warmest and best reserved for winter, mountaineering and long tough terrain, but it is often too hot and thick for summer or for boots with a snug fit.

Sock height for UK trails

The rule is simple: your sock should sit higher than your footwear cuff, otherwise the top of the boot rubs bare skin raw. Choose height to match your footwear rather than fashion.

No-show and ankle socks work only with low-cut trail shoes. Crew height, a few inches above the ankle bone, is the classic all-purpose hiking height and clears most mid and full boot cuffs while keeping grit out. Knee-high socks are for mountaineering boots, gaiters and cold-weather warmth, and can add mild compression on long challenge events.

Getting the size and fit right

Fit prevents blisters more reliably than any single feature. A sock that bunches, wrinkles or slips creates the friction points that raise blisters, whatever it is made from. Look for a reinforced heel and toe, a fitted arch band that stops the sock migrating, and a flat, low-bulk toe seam.

Hiking socks are usually sold in ranges (small to extra large) rather than exact sizes, with each range covering two or three shoe sizes, so always check the brand's own chart. Go by your true foot size, not the size you sized up to in your boots, and if you fall between sizes, size down to avoid excess material bunching. Try new socks on with the boots you actually walk in before a big day.

Liner socks and toe socks for blister-prone feet

If you are prone to blisters despite a good single sock, a double-layer system can help. A thin liner sock worn under the main sock moves the friction to the sock-on-sock interface instead of your skin, and wicks moisture off the foot. The catch is that it only works if both layers fit snugly and your boots have room for the extra bulk; loose liners slide and make things worse.

Toe socks wrap each toe individually to stop toe-on-toe rubbing, which is a common cause of blisters between the toes on long descents. They take getting used to and add bulk in the toe box, so check they do not tighten the fit. Both are tools for specific problems rather than a default requirement: many walkers never need more than one quality sock.

Layering socks for winter walking

In cold conditions a heavier merino sock, or a thin liner under a mid or heavy sock, adds useful insulation and keeps feet warmer when you slow down or stop. Winter is the one time two layers make easy sense, because you are far less likely to overheat and sweat than in summer.

Whatever you layer, make sure the boot still has room. A sock system that crushes the foot cuts circulation and makes cold feet worse, not better, so size winter footwear with thicker socks in mind.

How to wash and care for merino socks

Merino socks last far longer with a little care. Turn them inside out, wash on a cold or 30°C gentle cycle with a mild detergent, and skip the fabric softener and bleach, both of which coat or damage the fibres. Optical brighteners and enzyme-heavy powders shorten a merino sock's life.

Air-dry flat away from direct heat. High dryer heat and hot water cause the fibres to felt and shrink, and you should never wring or twist wet wool, as that snaps fibres and pulls the sock out of shape. Done properly, a good merino blend will comfortably outlast several pairs of cheap cotton socks.