The classic straps are synthetic PU with a synthetic mesh lining. Compression molded EVA footbed. Spenco's proven TOTAL SUPPORT? Contour. Deep heel cupping. Orthotic-grade arch support. Metatarsal dome. Cushioned forefoot. Lightweight, two-part outsole. 5 heel lift for maximum comfort. Non-slip, non-marking outsole. Antimicrobial helps control odor.