HoverSpring: Our proprietary lightweight HoverSpring foam provides industry leading underfoot comfort and flexibility while being durable enough for the harshest environments. Timberland PRO FLEX : Technology gives you full range of motion without resistance and has features like anatomically positioned flex grooves under your foot and durable fabrics that stretch above your foot ensure your shoes will work with you in every step. 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 Waterproof Membrane: Delivers maximum waterproof protection and meets ASTM F1671-07 safety standard. Rubber Outsole: Heat-resistant, durable rubber compound offers enhanced slip, oil and abrasion resistance.