Dual-layered Blundstone 587 Leather Lined Chelsea in Rustic Black cradles feet in leather and rebuffs scrapes and nicks with a tough outer layer. All-season, all-surface comfort. Unisex sizing. F Premium leather Extra set of footbeds for fit adjustment. Leather lined. S Thermo-urethane outsole resistant to hydrolysis and microbial attack. Polyurethane midsole for comfort. XRD in the heel strike zone to dissipate heel strike shock. Comfort EVA removable footbed with XRD in the heel pad.