All Year Comfort & Warmth in the Mountains. Comfort: WoolFusion® of Merino/Coolmax®. Low tension cuff. Summit: Designed for mountains and cold environments. Outdoor ventures, any season, anywhere – from mountain climbs to trail walks. WoolFusion® warmth and softness, that ensures dry and comfortable feet. Fibre Content: 48% Coolmax®/ polyester 30% Merino Wool 21% Nylon/polyamide 1% Lycra®/elastane