Purpose and key benefits Optimizes arm movement and hand entry based on trainer-informed design to improve stroke mechanics. Strengthens core and leg muscles in the water by providing stable, targeted buoyancy for progressive skill development. Ensures reliable, repeatable support during drills so swimmers can focus on technique for measurable performance gains. What makes this product effective Six grip openings: flexible hand positioning across key zones enforces correct hand placement and improves pull technique for more effective training. Trainer-backed shape: supports a natural arm path and reinforces proper body alignment while swimming. Durable, high-elastic EVA material: offers excellent flexibility and pressure resistance, retains shape over repeated use, and resists tearing for long-term reliability in swim lessons. Functions and compatibility Designed specifically for crawl (freestyle) and breaststroke training; usable in instructor-led classes, club practice, or individual drills. Provides dependable buoyancy that supports posture and kick development while allowing realistic stroke practice. Suitable for use with children in swim instruction and for technique-focused adult sessions where controlled support is needed. Performance and care Maintains form and performance across many training sessions thanks to pressure-resistant EVA construction. Easy to handle and position, offering consistent feedback to swimmer and coach without altering natural stroke timing. Typical use scenarios Swim lessons with instructors: helps beginners develop correct arm entry and a balanced body position while instructors guide hand placement through the grip openings. Technique-focused practice for club swimmers: isolates arm mechanics and core stabilization during freestyle and breaststroke drills to accelerate skill improvement. Home or pool-rehab sessions: adds controlled buoyancy to support safe kicking and body alignment work under supervised practice. Material: high-elastic EVA Primary functions: arm movement optimization, core and leg strengthening, buoyancy support for freestyle and breaststroke training Key feature: six grip openings for correct hand positioning