The crew length 1000 Mile Approach Sock is designed for maximum comfort with today’s technical approach footwear. The inner layer stays with the foot, wicking away moisture, whilst the outer moves with the shoe, reducing friction and helping to prevent blisters and reduce wear. The unique combination of fibres maintains a comfortable temperature for the foot, making this the perfect warmer weather outdoor activity sock to wear with lightweight boots as well as approach/trail shoes and sandals. Technical Information; Arch bracing for additional support and custom fit Double layer construction eliminates friction between foot and shoe, reducing wear and helping to prevent blisters HeelPower design grips the heel firmly in place so no slippage! 71% Recycled Content Outer Layer: 42% REPREVE® Nylon 6 20% wool 18% acrylic 18% polyamide 2% elastane Inner Layer: 99% REPREVE® Nylon 6 1% elastane. Machine wash at 30 degrees. Avoid bleach and tumble drying for long-lasting durability.