Made of imported polyester fiber, safe and reliable. Utilizing 210D high-density fabric, it is durable, comfortable, and breathable. The detachable crotch strap design ensures a secure fit in deep water and freedom of movement in shallow water. Stable buoyancy keeps the baby's head above water, maintaining a natural upright posture. High-density foam provides optimal weight distribution and anti-tipping stability. Features include double safety buckles, a U-shaped safety fit, widened anti-friction crotch pads, double-layered thickened cuffs, reinforced stitching, and adjustable shoulder straps. Size S is suitable for babies weighing 24-33 lbs (approximately 11-15 kg), and size M is suitable for babies weighing 33-66 lbs (approximately 15-30 kg). High-contrast pattern for clear visibility. 365-day worry-free protection, all-weather support. Weight: 0.57 lbs (approximately 250 grams).