The Swim Resistance Parachute is designed to strengthen swim-specific muscles and improve power, endurance & explosiveness. An adjustable clasp at the end of the Swim Chute regulates the amount of water that flows through the orifice of the chute. The resistence varies up to 15 lbs. The Swim Chute can actually increase your range of motion and flexibility as you are able to stretch each of your muscle groups to their maximum potential. The Swim Chute can also be used for running, jogging or physical therapy in water. Comes with a belt.