The Aquafins™ Exercise Kit introduces you to a new way to work out in the water. The unique, one-size-fits-all cuffs and Predator Fins are made of soft Santoprene® rubber for strength and flexibility, and can be worn comfortably on the wrists or ankles for full body conditioning. Each kit contains 2 cuffs, 4 Predator Fins, 1 mesh carrying case and detailed instructions for toning and strengthening legs and lower back, inner and outer thighs, arms, chest and upper back.