Whether on K2 or Denali, the Iceline is the ultimate in extreme mountaineering performance for the coldest of conditions.

Part of our Extreme Expedition sleeping bag range, the Iceline is designed for high-altitude mountaineering and extended use in all but the very coldest environments.

Using 994g of exceptionally high-quality minimum 800-fill power CODEX-approved European goose down and a lightweight yet durable GORE-TEX WINDSTOPPER® 10 denier outer fabric, the Iceline keeps you warm in extreme temperatures while also being highly breathable and water resistant.

Extreme Expedition bags like the Iceline utilise our most complex baffle system. Through the chest and upper legs, V-shaped baffles over maximum down overlap and eliminate cold bridges, while trapezoid baffles prevent down migration across the middle of the bag. Full-length baffles down each side maintain the bag’s optimised box-like structure. A complex seven-baffle system concentrates down in the hood for optimum warmth and protection over long-term use. In contrast, a six-baffle system focuses warmth around your feet in the anatomically shaped foot box.

Down type and density are varied strategically through the bag to ensure it can resist compression on the underside while allowing maximum loft on the top. Internally, our time-tested EXL® elasticated stitching system inside the bag minimises dead airspace, reduces drafts, and pulls the liner fabric away from the down, allowing it to loft effectively for maximal warmth.

A full-length Gemini™ entry zip baffle dramatically reduces heat loss in this typically vulnerable area, and the low-profile magnetic Lode Lock™ closure and collar drawcords are easy to use in the dark. An internal mesh pocket and secure zipped pocket keep essentials close to hand.

A roomy Expedition fit ensures comfortable sleeping and accommodates extra down layers, while a large foot box with a breathable GORE-TEX WINDSTOPPER® liner accommodates boot liners and wet items.

With a Good Night’s Sleep Temperature of -30oC (-22oF), the Iceline is an exceedingly warm, practical and durable sleeping bag for those pushing their limits in extreme mountain environments.

For our Expedition bags, we don't give Comfort, Limit or Extreme limits, as the ISO 23537 test excludes the testing of “extreme climate zone expedition” sleeping bags, or bags which have a measured limit temperature colder than -24 °C.

• GORE-TEX WINDSTOPPER® 10D outer shell is durably light highly breathable and rain-resistant
• 994g of 90-10 European Goose Down with a minimum fill power of 800
• Expedition fit with EXL® system is both roomier and has improved loft and thermal efficiency
• V chest and foot baffles & Trapezoid main body baffles
• Ground level side seams with V-side baffle
• 7 baffle low volume anatomically shaped hood
• 6 baffle anatomically shaped and offset foot-box
• Full length Gemini™ zip baffle and integrated neck collar with Lode Lock™ closure
• GORE-TEX WINDSTOPPER® 10D inner foot-box and hood lining
• Inner pocket for keeping essentials warm and dr