10 mm drop: due to variances created during the development and manufacturing processes, all references to 10 mm drop are approximate. Allows greater flexibility in the forefoot area. EVA (Ethyl Vinyl Acetate) footbed/heel pocket. IMEVA (injection-molded EVA foam) midsole for firm yet flexible cushioning. Internal shank. Leather upper. Medicare / HCPCS code = A5500, may be eligible for Medicare reimbursement. Non-marking outsole. 52 durometer insert/midsole. Style WX624WT2 is approved Medicare/HCPCS code = A5500, may be eligible for Medicare reimbursement.