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