Anti-Fatigue Technology: A comfort system designed with shock-absorbing, geometrical technology that returns energy back to the foot to deliver all-day support and comfort. Waterproof Membrane: Delivers maximum waterproof protection and meets ASTM F1671-07 safety standard. All-Weather TPU Outsole: Specially-formulated thermoplastic urethane compound designed to maintain flexibility in variable weather conditions, providing enhanced traction on wet and frosted ice surfaces, plus slip, oil and abrasion resistance. Electrical Hazard Protection: Provides secondary underfoot protection against live electrical circuits, electrically energized conductors, parts or apparatus and meets ASTM F2412-18a, ASTM F2413-18, ASTM F2892-18 standards. ReBOTL Material: Products with ReBOTL material contain at least 50% recycled PET (recycled polyethylene terephthalate, the stuff plastic bottles are made of) excepting trace materials.