The Ultra Stretch Fins Socks are made in two size designed for people who live in their fins and need that perfect snug fit of a full foot fin. Recommended also for people who seldom use fins or have sensitive feet. These socks are the solution that will allow you wearing your fins for hours a more without chafing your feet. Made in Ultra Stretch synthetic fiber allows Quick Dry. Designed by Cressi, Italian company which has more than Seventy years of experience.