This 6" Slip-on boot features 100% full-grain black leather with an easy off/on design. The TPU (Thermoplastic Polyurethane) soles are oil/acid/slip resistant while the PU (Polyurethane) shock-absorbing mid soles take the beating so your legs and back don't have to. Slip Resistant - MARK II Machine tested slip resistant on oil, acid & water. Anatomic Support System - Redback's unique Anatomic Sole cradles the foot to reduce arch sagging and prevents foot strain, fatigue and related leg and back pain. Electrical Hazard Safe - Our boot meets and exceeds OSHA & ASTM F2413-05 standards for Electrical Hazards. Impact/Compression - Steel Safety Cap meets and exceeds OSHA & ASTM F2413-05 standards for Impact & Compression.