Lucy Wallace has had the Mammut Women’s Perform Down Bag -10C for an entire winter. Here’s why she recommends it.
Mammut’s women’s sleeping bags complement their men’s/unisex range with features specifically tailored to the average female physiology. This isn’t a gimmick: women typically sleep cooler and are more prone to cold spots around the thighs and glutes due to body fat distribution. To address this, the Mammut Women’s Perform Down Bag -10C is rated 3°C warmer than the standard model. It’s also slightly shorter, but with a maximum recommended height of 180cm, it’s longer than many women’s-specific bags.
Lucy Wallace recommends
A quality down bag is always a significant investment, but this one strikes a clever balance of performance, comfort, and affordability that will suit a broad range of users.- weight
- price
- down fill
- a good compromise of warmth
- Not as warm or light as some pricier options
| Quick Specs |
|---|
| Price: $299 | £370 (available from Mammut) Weight: 1166g with stuff sack Fill: 542g 700 fill power 100% RDS recycled grey duck down Shell: 100% Polyamide Construction: Box Wall Zip: 145cm two-way YKK Length: max height 180cm Rating: Comfort-3 /Limit-10 Sizes: M Men’s version? Unisex version available rated to -7 limit www.mammut.com |
For me, this was a big win as I’m often too tall for women’s bags. This time I could stretch out and still feel snug. Comfort is excellent. The mummy hood has a soft, rustle-proof lining, and the neck baffle seals in warmth beautifully. I was sceptical about the central zip at first, but it was actually quite handy, especially when sitting up.
The anti-snag zip works very well, and it glows in the dark, which is both clever and a little alarming. As a side sleeper, I found the down distribution worked well in any position. There’s enough space to stick a leg out and no draughty cold spots. The Perform also scores well on sustainability. It uses recycled down certified by the Responsible Down Standard (RDS) and a PFC-free durable water repellent (DWR) finish.
In terms of performance, I was impressed. As a mid-spec bag, it’s warm enough to be comfortable year-round on most UK mountains and in a wide range of conditions. It isn’t quite warm enough for a snowy camp on the Cairngorm Plateau though. While there are lighter, warmer bags available with higher fill-power down, they’re often much pricier and strip out features I really valued here such as the hood lining, and generous build.
A quality down bag is always a significant investment, but this one strikes a clever balance of performance, comfort, and affordability that will suit a broad range of users.
How we tested
Chris had this bag on extended test last winter, giving him the chance to sleep out in a wide range of conditions, right across Scotland. Weights quoted are from his own digital scales. This review was first published in the December 2025 issue of The Great Outdoors.
