AIRfeet Outdoor O2 Insoles KS7+ The splint creates a dynamic The splint creates a dynamic springboard action under the big toe joint or first metatarsal using the tension band concept to distribute force across the length of the entire metatarsal instead of directly on the joint during the toe off segment of walking or running (propulsion) The Bunion Relief Sock features Orthosleeve's original “split toe” design to separate the big toe and cushion the bunion for added comfort The AIRfeet Outdoor O2 massaging insoles are designed to ergonomically dispense an impacting energy AIRfeet were designed for simplicity of use with outstanding results