Trainers from Swissies. Exterior of synthetic. Velcro strap over the foot. Inner of mesh. Removable inner sole of leather. Light & soft with 50% air for a better ride. Gives a impression of going barefoot which gives a better posture & health, a pressure over the whole foot sole & not only at the front & back. Recommended by doctors & orthopaedists. Outer sole of rubber.