When you need that little extra boost of warmth in the backcountry, slip on the Norrona Lyngen Down850 Knickers. Designed for ease of use with full side zips and a boot-compatible 3/4 cut, these pants are an innovative and convenient way to stay warm on cold ascents and alpine adventures. The body is insulated with lightweight yet insanely warm 850-fill down insulation, while the seat features synthetic insulation that won't mat down or soak through when you take a load off in some wet snow. Whether you rock it under your shell or as an outer layer, you won't have to fumble with your boots to get them on or off, thanks to the lengthy side zippers. Your ski boots and long winter socks will make up for the missing lower-leg warmth, and when you decide that the weather's warmed up enough to ditch your knickers, you can stuff them down small and throw them in your pack. You may get some looks rocking them at apres spots, but they get the job done in the backcountry and that's all that matters.