Expedition level warmth in a super compressible design, making the Nila Down Mitt an excellent choice in cold & mixed conditions. Insulated with Mountain Hardwear's highest quality 800 fill down makes for extreme warmth. The Out Dry Waterproof Technology used in these mitts means they are extremely waterproof & totally windproof. The Out Dry membrane is directly bonded to the glove's outer shell, eliminating the ability for wind & water to penetrate through the sewn seams of the shell, keeping hands warmer.