The carbon insert also protects your feet and shoes when you're hiking on rugged terrain outdoors, it can effectively prevent the shoes from over twisting and the puncture of sharp objects. Carbon
fiber material is used in medical,airplanes, space technology, race cars and sporting goods equipment for the unique combination of lightweight, high stiffness and durability. Very thin thickness of carbon
fiber sheet has enough hardness and strength. For proper fit carbon
fiber insert must be ¼ - ½ inch (approximately 1 cm) shorter than removable insert in shoe (because it is stiff), If in between sizes or half sizes round down to smaller size, and you should use this semi-rigid insole below your original removable insole. Carbon
fiber insert thickness:1.0mm , it is light and thin. They can be worn on your right or left foot. And the insert must be placed directly under the removable shoe insole or under orthotic. Less stiffening and more flexible carbon
fiber insert, Treatment for injuries such as turf-toe, mid-foot sprains, metatarsal stress fractures, toe fractures, hallux limitus, prevention of recurring chronic injuries, and transition from rigid insert to semi-rigid as injury improves.