Warm and comfortable tent and hut socks constructed from cutting edge PrimaLoft® ACTIVE insulation. Minimal seam construction makes these socks extremely comfortable to wear in your sleeping bag, and they are exceptionally warm for there tiny weight. PrimaLoft® ACTIVE is a revolutionary new concept in insulation. PrimaLoft®’s industry-leading insulating fibres are women through a fine polyester mesh. The resultant structure is warmer and less than half the weight of a conventional fleece product. Designed for gentle use only. They will not survive being used inside shoes while active. Features Warm when wet. Wind & water resistant Nylon outsole. 4-way stretch. Minimal seams. Specifications Fabrics PrimaLoft® ACTIVE 125g/m2,PointZero (Nylon) Weight 38g Sizes S, M, L, XL