Scuba Diving Snorkeling 3mm Neoprene Fin Socks Foot Protector Available sizes: XS, S, M, L, XL. -Length from toe to heel XS: 8" S: 9.5" M:10" L:10.5" XL: 11" -XL:Men 12-13. -Large: Men US 10-11/ Women 11-12. -Medium: Men 8-9/ Women 9-10. -Small: Men 6-7/ Women 7-8. -X-Small: Men 3-5/ Women 4-6 3mm neoprene. Perfect for scuba diving, snorkeling, swimming.