The Gul Ecotherm Bamboo Evotherm thermal socks have been designed using 80% Eco-therm fabric with nano bamboo charcoal lining, 65% Recycled polyester, 6% spandex, 29% Bamboo, creating an extremely light weight thermal sock great for use in cooler sailing conditions. Quick drying and naturally resistant to mould and bacterial growth which could cause odour and skin irritation. The bamboo lining has derived from Bamboo plants which has been grown 100% naturally, thriving naturally without the use of fertilisers or pesticides, releasing more oxygen in to the earths atmosphere than trees. Making it a 100% sustainable and earth friendly. The Gul Ecotherm Bamboo sock will stay light weight and won't get heavy and damp when wet.