Small (13-30 lbs), Medium (30-66 lbs). Adjustable shoulder straps, carrier straps, and crotch straps provide a comfortable and snug fit for children aged 1-3 years. The double safety buckle requires pressing three buttons simultaneously to open, preventing children from unfastening it themselves. The detachable crotch strap helps toddlers float and maintain balance. Made with ultra-soft polyester fabric and high-density foam, it features a lining behind the buckles for skin protection. Brightly colored patterns make children more visible in the water. Must be used under adult supervision. Weight: 0.9 lbs (approximately 0.4 kg).