Extended Hiking in Warmer Conditions. Endurance: WoolFusion® for durable performance. Trail: Designed for Walking and Hiking in warmer conditions. Lightweight style designed for lightweight footwear, for day-hiking or warm weather trekking. Fibre Content: 40% New Wool 35% Nylon/polyamide 24% Endurofil™/polypropylene 1% Lycra®/elastane