Altitude Socks Knee - Black

Developed in collaboration with mountaineer Simone Moro, ALTITUDE MERINO FIR combines thick cushioning with knee-high coverage extending up the calf for demanding hikes, high-altitude mountaineering and cold-weather expeditions. In the Extra warm climatic range, its substantial construction prioritises insulation and comfort inside mountain boots, rather than a thin, lightweight feel.

The 80% Merino wool blend provides natural warmth, thermoregulation and moisture management, complemented by ACCAPI FIR technology for thermal comfort. High- and medium-density zones distribute cushioning through the foot, with targeted reinforcement at the heel, toe and Achilles area. LONG LIFE construction adds wear resistance for repeated mountain use, while flat joins and BIOTENDER-TR treatment provide a smooth, soft feel against the skin.