Sealskinz Bircham Waterproof All Weather Ankle Length Sock - Black / Grey Marl / XLarge Black/Grey Marl XLarge

100% waterproof and thermoregulating, the Bircham excels in high-intensity sports, as well as more relaxed outdoor pursuits. Handcrafted in the Sealskinz factory in Norfolk.TechnologyOuter - Extra-durable polycolon and nylon blend, with 4-way stretch for an optimal fit.Mid-Section - Aquasealz™ waterproof membrane releases moisture vapour from inside the sock.Interior - Premium merino wool for comfort and sweat-wicking. Natural antimicrobial properties, inhibiting growth of odour-causing bacteria.The Bircham combines premium merino wool with performance-driven, engineered fibres. The outcome: a highly functional sock with a natural feel. Each stratum of the Three-Layer Aquasealz™ Composition assists in the release of internally generated moisture, aiding thermoregulation. The Aquasealz™ hydrophilic membrane is completely waterproof, keeping feet dry in the wettest of conditions. Ankle length complements the overall breathability of the garment. Mountain biking, trekking, trail running a