Quick verdict
The Mammut Broad Peak Pro IN Hooded Jacket is the fast-and-light down jacket done properly: 150g of 800 fill DRY DOWN under a 10 denier recycled polyamide shell, 416g all in, and a 5 out of 6 rating on Mammut's own warmth scale. It gives up 50g of fill to the Taiss Pro Belay, the winner of our extreme-cold guide, and saves 162g of carried weight in return. At £390 it is the pick for gram-counters and quick movers who want real down warmth in a jacket that lives in the pack.
Mammut Broad Peak Pro IN Hooded Jacket: 4.4/5
150g of 800 fill DRY DOWN in a jacket that totals 416g under a 10 denier recycled shell, rated 5 out of 6 on Mammut's warmth scale. Serious down warmth at a weight you forget is in the pack.
- This jacket: Mammut Broad Peak Pro IN (~£390)
- Warmer at a stop: Mammut Taiss Pro Belay (~£400)
- Move in it: Mammut Taiss IN (~£350)
- Lighter still: Rab Mythic Alpine (~£297)
The full review is below.
The Mammut Broad Peak Pro IN Hooded Jacket took the fast-and-light slot in our best down jacket for extreme cold guide, and it earned a review of its own for one reason: the ratio. This is 150g of 800 fill DRY DOWN in a jacket that weighs 416g all in, and Mammut still rates it 5 out of 6 on its own warmth scale. Very few jackets put a fill weight that serious under a total weight that small.
The short version of the verdict: if your down jacket spends the day in a pack and comes out at stops, and every gram of that pack is accounted for, this is the strongest case Mammut makes for your £390. If your priority is maximum warmth at a standstill and the weight rides easy, the Taiss Pro Belay remains the better buy, and the gap between the two is the most useful comparison in this review.
Who this jacket is for
This jacket is for: the walker, backpacker or alpinist who counts grams and moves quickly. People whose insulation lives in the pack for most of the day and earns its place at summit stops, lunch halts and cold camps. Anyone building a light winter system where a 578g belay jacket feels like the wrong tax on every mile before the stop.
This jacket is not for: the buyer whose whole question is maximum static warmth, because ten pounds more buys the Taiss Pro Belay and its 200g of 850 fill. Nor is it the pick for consistently damp British cold, where down's old weakness applies and a synthetic like the Rime Pro Belay keeps insulating when moisture gets in.
Specs
- Price
- £390
- Total weight
- 416g
- Insulation
- Mammut DRY DOWN, 800 cuin fill power
- Fill weight
- 150g
- Shell
- 10D x 10D 100% recycled polyamide
- Warmth rating
- 5 out of 6 on Mammut's own scale
- Sizes
- S to XXL, all available
- Colours
- Black, Dark Mammut Red, Deep Teal
- Women's version
- Yes, on its own cut
The warmth: 150g of 800 fill at 416g
Two numbers decide how warm a down jacket is: fill power, the quality of the down, and fill weight, how much of it is actually inside. Plenty of light jackets lead with a big fill power and quietly carry 80g or 100g of it, which makes a lovely spring layer and a poor answer to real cold. The Broad Peak Pro carries 150g of 800 fill DRY DOWN, the same fill family Mammut runs through the Taiss line, and that is a proper fill weight, not a token one.
Mammut's own warmth scale is the useful cross-check, because it lets you compare within the range instead of guessing. The Broad Peak Pro rates 5 out of 6, the same band as the 578g Taiss Pro Belay and the 547g Rime Pro Belay. It reaches that band at 416g. That is the whole pitch of this jacket in one sentence.
In use terms, that puts the Broad Peak Pro comfortably beyond UK three-season duty. This is a jacket specified for cold that bites, the standstill moments of a hard winter day, sized so that carrying it costs you less than any comparable warmth in Mammut's range.
The shell: 10 denier and recycled
The shell is a 10D x 10D 100% recycled polyamide, and the denier figure is doing a lot of work in that 416g total. Ten denier is seriously fine fabric territory, the kind of weight used where every gram matters, and it is a large part of how a 150g fill weight ends up in a jacket this light.
The trade is the same one every sub-15-denier shell makes: this is fabric to look after. It will handle normal wear, pack life and layering; it is not the jacket to drag through gorse or grind under a heavy haul bag. Buyers used to the burlier faces on classic expedition down should treat it as precision kit, because that is what it is.
The 100% recycled construction deserves credit too. Fully recycled shell fabrics are common at heavier weights; delivering one at 10 denier is the harder version of the job.
Check the price at MammutMammut Broad Peak Pro vs Taiss Pro Belay: the 162g question
The Taiss Pro Belay won our extreme-cold down jacket guide, so the sharpest way to place the Broad Peak Pro is against it. The two are ten pounds apart in price and answer different questions.
The Taiss Pro Belay is the static-cold specialist: 200g of 850 fill DRY DOWN in boxwall chambers, synthetic insulation at the shoulders and forearms where compression flattens down, and a belay cut sized to go on over everything at a standstill. It weighs 578g and it is the warmest jacket a UK walker can realistically carry and use.
The Broad Peak Pro gives up 50g of fill and takes 162g off the total. Both sit in Mammut's 5 out of 6 warmth band, with the Taiss Pro at the top of it. So the decision is not about quality, it is about where your day puts the weight. If the jacket is out of the pack for two long stops on a fourteen-mile winter round, the Taiss Pro's extra down is cheap warmth. If the jacket rides in the pack from dawn until the stop, 162g saved on every step is the number that compounds.
My steer: buy the Taiss Pro Belay if static warmth is the mission and the Broad Peak Pro if the miles are. The £10 difference should play no part in the decision; the 162g should decide it.
If neither is quite right, two more from the same family are worth a look. The Taiss IN (£350, 345g) is the hybrid you keep on while moving rather than throw on when you stop. And outside Mammut, the Rab Mythic Alpine (£297, 313g) runs 140g of 900 fill even lighter, in Rab's small-batch runs that sell through fast. Both have full write-ups in the extreme-cold guide.
Colours, sizes and the women's version
The Broad Peak Pro runs a full S to XXL, all sizes available at the time of writing, in three colours.
The Broad Peak Pro in three colours
All £390 direct from Mammut. Tap a colour for that exact listing.
The women's Broad Peak Pro is built on its own cut rather than a resized men's pattern.
Buy the women's Broad Peak Pro INWhy buy it direct from Mammut
For a £390 down jacket, buy from the maker. Mammut's own store carries the complete S to XXL run and the current season's three colours, where third-party listings tend to hold fragments of last season, and fit is not the place to compromise on a jacket whose job depends on it. Buying direct also puts you inside Mammut's own warranty and aftercare channel from day one, with no argument about where the jacket came from. A down jacket at this level should be a decade-long relationship, and this is how you start it.
Pros and cons
- 416g total for a jacket Mammut rates 5 out of 6 for warmth
- A real fill weight: 150g of 800 fill DRY DOWN, not a token gesture
- 162g lighter than the Taiss Pro Belay for £10 less
- 10 denier shell in 100% recycled polyamide
- Full S to XXL size run in three colours
- Women's version on its own cut, not a resized men's pattern
- The 10 denier shell is precision kit: treat it with care around rock and gorse
- For pure static warmth, £10 more buys the Taiss Pro Belay's 200g of 850 fill
- Down rules apply: persistently damp British cold favours a synthetic like the Rime Pro Belay
- 800 fill power sits below the 850 in the Taiss jackets and the 900 in Rab's Mythic range
Verdict
The Mammut Broad Peak Pro IN scores 4.4 because it executes a clear brief almost perfectly and is beaten only at jobs it was never given. As a fast-and-light down jacket it is the strongest offer in Mammut's range: a fill weight that means business, a 5 out of 6 warmth rating, and a total weight that changes how willingly you carry it. The only buyers who should spend their £390 elsewhere are the static-cold specialists, who want the Taiss Pro Belay, and the wet-cold walkers, who want synthetic.
For everyone whose winter days are measured in miles before they are measured in stops, this is the one to buy.
Gram-counters and quick movers who want real 800 fill down warmth in a jacket that lives in the pack all day and earns its 416g the moment they stop.
