I purchased this last year but didn't use it, so it's brand new. Size is 29cm. Manufacturer Details: Material: Neoprene Color: Black Brand: FELLOW Item Thickness: 3.5 millimeters Sports: Surfing, Paddleboarding, Fishing, Boating Age Range: Adult Surf Boots for Cold Protection - Men's, Women's, and Junior's 3.5mm Neoprene Winter Marine Sports Winter Sports Boots SIZE: 29cm Color: Black, 1 type in total, Japanese standard product Features maximum heat retention with heat-retaining brushed lining, and uses 3.5mm neoprene for easy movement even in the winter sea. Belt type for a secure hold. Adjustable with Velcro.