The unsinkable swim disc for adults requires no inflation. Two to four swim discs per arm provide beginners with enough safety for their first swimming attempts, making it ideal for deep water. Depending on your comfort level, you can increase or decrease the number of discs as you learn. This physiotherapeutic swimming aid serves as a therapeutic exercise device. The material shows no wear; in the event of damage, there is no loss of buoyancy, as the discs float. Made from 100% waterproof foam, they are resistant to heat, cold, rot, chlorine, and saltwater.