Carbon Nanofiber Safety Toe Cap. Innovative Carbon Nanofiber material makes these safety toes the lightest and most advanced safety toe available today. The weight of these toes is 50% less than a traditional steel safety toe cap and 40% less than a standard composite toe cap. These toes will not conduct heat or cold, will not activate metal detectors, are non-magnetic, and static free. All Carbon Nanofiber Safety Toe styles meet or exceed all ASTM 2413-11 I/75 C/75 impact and compression specifications.