Comfortable fit: Made of nylon and PP materials with durable nylon webbing for good wear resistance, providing a secure and comfortable fit during use. Three sizes available: Choose from three sizes to match your needs and ability level. You can progressively increase resistance as your swimming ability improves. Safe and effective training: Delivers stable resistance training effects without safety hazards, making it a safe and effective swimming training tool. Durable and flexible design: Features 360degree rotating quickrelease buckles that are firm, enduring, and flexible with no twisting. Includes a storage bag for easy portability. Use scenarios Pool lap training: Attach the device to your legs or arms to add adjustable resistance, helping to build kick strength and stroke power as you progress through the sizes. Technique and conditioning workouts: Use in shallow water to focus on form and leg endurance, gradually increasing resistance to challenge your muscles. Triathlon and general fitness training: Incorporate into regular pool sessions to diversify workouts with controllable resistance, supporting steady performance improvements over time.