Step Propel Footbed: designed to store energy and release it back to your feet with every step, through thousands of small, ultra-compressed beads. CarbonShield Technology: Engineered with nanotechnology, adds strength and unmatched protection, provides a better fit and reduces weight with a lightweight, non-metallic, asymmetrical-shaped toe cap that meets US safety standards including ASTM F2412-18a and ASTM F2413-18 I and C impact and compression safety standards. Waterproof Membrane: Delivers maximum waterproof protection and meets ASTM F1671-07 safety standard. Vibram Rubber Outsole: Articulated Vibram outsoles are made with a medium-soft compound for superior traction in rock-based environments and are zoned for flexibility and independent lug deflection to minimize weight and maximize traction. Exospine Technology: Originally engineerd for Pull-On work boots, this technology provides lasting structure and durability, as well as improved heel fit.