Lorpen Unisex Tri-Layer Superlight Ski Overcalf Sock Unisex trilayer superlight ski overcalf Trilayer knit technology layers both synthetic and natural yarns in a way that improves moisture management, comfort and durability 38% Primaloft Eco Polyester yarn, 37% merino, 15% nylon, 10% lycra Primaloft blends 50% virgin fibers and 50% recycled fibers to create a high loft performance insulation. Overcalf height