Nano Composite Safety Toe. Identifies protection against impact and compression hazards with a Carbon Nano (non-metallic) safety toe. Nano Composite safety toes meet ASTM F2413-18 standards. Static Dissipative. SD shoes reduce the risk of static shock to people and to the manufactured product in the workplace. Meets the ASTM F2413-18 SD35 standards. Rubber Toe Bumper. The rubber toe bumper feature is designed to provide extra abrasion resistant durability. FastDry Technology Lining. FastDry lining wicks away sweat for comfort. Insite Technology Footbed. Carhartt footbed made with Insite technology is engineered to create maximum arch support to reduce foot fatigue during long days on the job.