ALL-DAY WOOL COMFORT The Shimano S-Phyre All-Season merino wool sock will keep your feet warm, dry and comfortable throughout day with arch/heel support and heel reinforcement. Constructed from a 78% Merino wool blend to absorb moisture to keep feet comfortable when you're riding hard.Suitable for all riding styles.Sizing guide: S-M 36-40 M-L 41-44 L-XL 45-48