The MediCordz Padded Thigh Strap is used for leg strengthening exercises and lower body workouts. The MediCordz Padded Thigh Strap is a padded strap with Velcro closure and a metal D-ring. Interchangeable. Comes in the following sizes: Small: 14-16in (35.6-40.6cm), Medium: 16-18in (40.6-45.7cm), Large: 18-21in (45.7-53.3cm), X-Large: 23-26in (58.4-66cm).