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Serious warmth for demanding alpine routes
Mountain Equipment says:
Part of our Extreme Alpine sleeping bag range, the lightweight Kryos is designed for alpine expedition use and cold-weather trips where low weight and extreme protection are essential.
Combining exceptionally high-quality minimum 800-fill power goose down with a highly breathable and water-resistant DRILITE® LOFT 10 denier outer fabric, the Kryos thrives in remote cold environments and can easily cope with snow melt and condensation. For added protection, the DRILITE® fabric extends into the bag's hood, around the collar and in the foot box—all areas prone to dampness.
Trapezoid baffles optimally balance weight and pack size throughout the bag against warmth and down control. A complex seven-baffle system concentrates down in the hood and collar for optimum warmth and protection over long-term use. In comparison, in the anatomically shaped foot box, a six-baffle system focuses warmth around your feet. A full-length Gemini™ entry zip baffle reduces heat loss in this vulnerable area, and the low-profile magnetic Lode Lock™ closure and collar drawcords are easy to use in the dark or under challenging conditions.
Our extreme alpine bags have a tapered Alpine fit that can accommodate additional down layers and boots as necessary and allow seated or fetal-position sleeping on restricted bivy spots.
With a Good Night’s Sleep Temperature of -20°C, the Kryos is the warmest bag in our extreme alpine range. This rating, determined through exhaustive lab work, countless field trials, and thorough expedition testing, indicates the minimum temperature at which we feel an experienced user will be comfortable in this bag in real-life situations.
Our Verdict
Mountain Equipment’s Kryos Down Sleeping Bag is built for cold, technical conditions where reliability and thermal efficiency are essential. At 1187g (Regular), it offers excellent warmth for its weight, with 743g of 800-fill European goose down housed in a DRILITE Loft 10D shell that combines light weather resistance with good breathability.
The fit is close and contoured, designed to minimise dead air and maximise loft. Mountain Equipment’s EXL system, elasticated stitching built into the lining, draws the bag slightly inwards around the body, helping the down stay close to the sleeper and improving thermal efficiency without restricting movement.
The hood and neck collar seal effectively, while the full-length zip and baffle system make temperature regulation straightforward. The trapezoid baffles maintain even distribution, preventing cold spots when conditions drop towards the -16°C comfort limit. The interior feels refined and comfortable, and the construction quality is excellent throughout. For high-level winter climbs or extended alpine bivouacs, the Kryos delivers dependable warmth, compact storage and precision engineering suited to demanding objectives where weight and protection are equally critical.
- Reviewed by Ultralight Outdoor Gear
Features
- Alpine Fit 2.0 with revised EXL® system improves comfort and loft whilst maximising thermal efficiency
- Trapezoid baffles throughout
- Ground level side seams
- 7 baffle low volume anatomically shaped hood
- 6 baffle anatomically shaped and offset foot-box
- Full length Gemini zip baffle with 140cm zip and integrated neck collar with Lode Lock closure
- DRILITE® LOFT 10D inner foot-box collar and hood lining
- Supplied with waterproof roll-top stuff-sack and storage cube
Specifications
Temperature Ratings
- Comfort: -9°C/16°F
- Comfort Limit: -16°C/3°F
- Extreme: -37°C/-35°F
- Good Night's Sleep Temperature: -20°C/-4°F
*Mountain Equipment use their own 'Good Nights Sleep Guaranteed' rating which they believe is a more accurate number for some sleeping bags and is based not just on the EN test results but on lab testing, their own use, thermal imaging and cold chamber work, along with a lot of data analysis.
Regular
- Weight excluding stuff sacks: 1187g
- Inside length: 192cm / 76in
- Inside max width: 78cm / 31in
- Inside foot width: 52cm / 20in
- Max user height: 182cm / 72in
- Fill weight: 743g / 26oz
- Packed size: 34 x 25 x 24cm / 13 x 10 x 9in
Long
- Weight excluding stuff sacks: 1262g
- Inside length: 207cm / 81in
- Inside max width: 78cm / 31in
- Inside foot width: 52cm / 20in
- Max user height: 197cm / 78in
Material & Construction
- DRILITE® LOFT 10D outer shell is ultra-light highly breathable and water-resistant
- 743g of 90-10 European Goose Down with a minimum fill power of 800
- DRILITE® LOFT 10D inner foot-box collar and hood lining
