Timberland PRO 24/7 Comfort System: A unique comfort system that meets the most rigorous worksite demands- 24 hours a day, 7 days a week- the Timberland PRO 24/7 comfort suspension system technology helped reduce foot fatigue, supports the arch and cushions every step 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. Timberland PRO Rubber: Heat-resistant, durable rubber compound offers enhanced slip, oil and abrasion resistance. OrthoLite comfort foam insoles provide moisture transport and long-term cushioning. The ultra-breathable material won't break down or lose cushioning over time, keeping your footwear comfortable and supportive. 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.