As the mercury creeps lower and morning rides require more and more layers, wrap your feet in the cozy warmth of Castelli's Primaloft 13 Socks. Made from light, insulated PrimaLoft fabrics, these socks cut a clean profile and feature added silk for extra softness. Reinforcement at the heel and toe means these socks will last through the years, and a 13cm cuff height sits at a trendy yet classic height just under the calf for ample ankle coverage to protect against the chill.