Lorpen's super-durable ALL SEASON TREKKER ECO all-weather trekking sock offers maximum protection on demanding treks, thanks to T3 reinforcement technology. The sock combines Coolmax® ECO synthetic fibre and Tencel® natural fibre to keep your feet dry and comfortable even on the hottest days. Tencel® for softness and moisture absorption Coolmax® Eco for moisture wicking and fast drying Nylon and Lycra for added durability Reinforced areas of three-layer construction prevent blisters and cushion footprint Specifications : Material: 51% Coolmax® ECO, 19% Red-Cycled Nylon, 15% Stretch Nylon with Lycra®, 15% Tencel® Height: Above ankle Size range: S - XL Warranty: 24 months Environmentally friendly: Yes