I purchased these new on Rakuten, but accidentally bought a duplicate pair, so I'm selling them. The following is an automatically generated description: Blue diving boots made of 1.5mm thick wetsuit material, size XL (26-28 cm), providing a comfortable fit. - Brand: DIVE & SAIL - Material: Wetsuit fabric - Size: XL (26-28 cm) - Thickness: 1.5mm - Color: Blue The following is the description from Rakuten: ● These fin socks are useful for preventing fin chafing and adjusting the size when wearing fins for snorkeling or bodyboarding. ● 1.5mm thick with a non-slip effect, protecting your bare feet from beaches and rocky areas. ● Made of wetsuit material for warmth, allowing you to enjoy comfortable snorkeling. Thank you for looking.