When your boots come off, the Altitude Booties go on. They bring the warmth, comfort, and traction you need for hanging out around camp and recovering from long days in the field. While weighing next to nothing and packing down small, these booties are warm, with full-coverage PrimaLoftA(R) Gold synthetic insulation bringing the heat. Unlike traditional down socks and booties, they have actual rubber outsoles with APEX Tread for plenty of traction when nature calls on snowy nights in camp. For pure comfort, these booties will always make the cut on your packing list. Features: Full-coverage 200g PrimaLoftA(R) Gold insulation is lightweight, packable & warm. Thin-wall rubber outsole provides protection & grip but packs down small SITKA Apex Tread System gives you confident traction on any terrain Synthetic rand adds durability Lightweight, removable PU insole for comfort & support Cinch collar locks in warmth & doubles as a compression cord for packability Rugged, tear-resistant nylon upper DWR finish repels light precipitation Weight: 17.1oz (per pair)