PowerFit Comfort System: A comfort system that uses ergonomically designed elements to supply movement and provide critical support for long-lasting comfort. Mark II: Mark II Oily wet #3 on American Olean tile exceeds .40 Timberland PRO Rubber: Heat-resistant, durable rubber compound offers enhanced 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. 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.