The Supalight Medley shoes are part of the manufacturer's Ocean Bound program. This means in practice that the surface and lining fabric, laces, and the loop at the back are made of recycled polyester material, which has been lifted from the sea, cleaned, and processed for new use. - The Max-Grip outsole has Hydro-Grip sipes - excellent grip, non-marking - The outsole material is 100% rubber - Comfortable HH Comfort insoles - EVA midsole contains 30% recycled fiber - Antimicrobial treatment prevents the formation of odors The product does not contain PFC compounds.