Design PhilosophyCold feet are the enemy of the winter cyclist. Fear not, thanks to Endura\'s Pro SL Primaloft Sock II cold feet will be a thing of the past.Primaloft®Primaloft® is the perfect material to help keep your feet warm for those cold winter rides. It\'s high warmth to weight ratio ensures that you get maximum warmth with minimal bulk. The magic of Primaloft means that it continues to provide some insulation even when wet if you get caught out by a passing rain shower and don\'t manage to get your overshoes on in time.90 Day Satisfaction GuaranteeSo confident are we in this product that, if you are not entirely satisfied with it then we offer a no-quibble refund or replacement policy within 90 days of purchase.