1) Comfortable back support This swim trainer provides comfortable back support to help beginners and swimmers improve buoyancy while maintaining a relaxed position in the water. 2) Adjustable design for perfect fit With an adjustable strap, this swim trainer delivers a secure, custom fit for men and women and accommodates different body types for effective pool workouts. 3) Lightweight and waterproof Made of high quality waterproof materials, this trainer is suitable for pools or the beach, offering a lightweight feel that stays in place for a smooth, gentle swimming experience. 4) Multipurpose for all ages Whether you are a beginner building confidence or an experienced swimmer needing extra support, this trainer fits all levels and is ideal for swimming lessons or water exercise routines. Use scenarios - Pool lessons or practice: helps new swimmers learn buoyancy and proper back positioning while remaining comfortable. - Water fitness or therapy: supports low-impact workouts and rehabilitation activities in shallow or deeper water. - Recreational swimming: provides dependable back support and secure fit for steady practice at the pool or beach.