Size: 11 Color: Black - USDA BioPreferred Certified - Renewafoam™ soles: reformulated polyurethane, just like your running shoes - Using excess waste, TIDAL soles are at minimum 27% renewable - Curved arch support (8mm to be exact!) - Supportive, no-slip treads  - Ultra-comfy straps, made with EcoPure® to enhance biodegradation - Made in USA