Elastic Water Sport Adult Socks for Snorkeling, Scuba Diving | ULTRA STRETCH FIN SOCKS by Cressi: quality since 1946 Cressi is a REAL diving, snorkeling and swimming Italian brand, since 1946. Made in two sizes designed for people who live in their fins and need that perfect snug fit of a full foot fin. Great for use inside boots or fins for added comfort and warmth. Also for people who seldom use fins or have sensitive feet. Quick drying thanks to synthetic fiber known for its exceptional elasticity.