1. Double-row thickened plastic buckle, more personal and safe 2. Neoprene fabric, soft and comfortable 3. Built-in EPE polyethylene foam, ergonomic design, can provide super buoyancy 4. Equipped with escape whistle, environmentally friendly material, loud and hygienic 5. Scope of application: swimming, water parks, rafting, snorkeling, motor boats, etc. 6. Size load bearing: S: 40-55kg M: 50-60kg L: 60-70kg XL: 70-90kg XXL: 90-110kg