Outdoor Research Tundra Aerogel Sock

Your favorite Aerogel bootie warmth, now in a slip-on sock design. The Outdoor Research Aerogel socks keep your feet extra toasty inside of your sleeping bag-or you can wear them around the cabin. Insulated with NASA-approved 133 g PrimaLoft Gold synthetic fibers with Cross Core Technology Exterior shells are breathable and water resistant Ankle cinch tops Anti-slip, microsuede soles are just durable enough for plodding around indoors Imported. Technical Specs Best Use Camping Footwear Height Over-the-ankle Footwear Closure Single-pull Lace Upper Polyester Lining Tricot Insulation 133 g PrimaLoft Gold synthetic fibers with Cross Core Technology Midsole Polyester suede Outsole Polyester suede Gender Unisex Outdoor Research Slipper Bootie Size Chart How to measure Please refer to your shoe size. XS S M L XL MEN 7-8 8.5-9.5 10-11 11.5-12.5 13-14 WOMEN 5-6 6.5-7.5 8-9 9.5-10.5 11-12