Professional Slip Resistant Clogs made per ASTM Industry Standard - The White House Chefs Endorsed Sponsor Kitchen Shoes, and the American Podiatric Medical Association Recommend Professional Footwear for Better Foot Health Products. EVA Foam Body Brings Ultra Light Weight, and Supportive and Comfortable with Ortholite Removable Insole. US Patent No.D808624, Special Designed Shape and Pattern to enable Units to Channel Fluids and Penetrate Hard Slick Surfaces to Increase Ability to Resist Slipping, and Easy to Clean, and All Washable Inside and Outside. Suitable for Chefs, Nurses, Gardeners and Any Other Industry Workers Needing Slip Resistant Footwear. Full Size Range From 4 to 16 US Men Size. For Medium to Wide Width Feet, Half to One Size Up is Recommended for Better Fit.