Slip on thong sandal with a big benefit. Soft woven fabric upper, on a cushioned contoured foam foot bed, with a heel pad and toe ridge for added comfort. The 3/4" foam mid sole is light weight and shock absorbent as is the 1 3/4" heel, on a rolling traction out sole. Their claim; Tone-ups design mid sole and out sole promotes weight loss with regular use, while strengthening muscles in back, buttocks and legs. Every box comes with an instructional book.