Skechers Tone Ups Hotness 37633 is a fitness sandal that will shape you up while you walk. Tone Ups Hotness vegan fitness flip flop will improve your posture, tighten up those leg muscles, and can miraculously reduce cellulite. Hotness 37633 sandals are available in black or natural with metallic accents and feature rubber sole and faux leather thong with soft fabric lining.