Great teaching tool for beginning to swim and building water confidence. Front zipper for easy on and off. Safety closure helps secure the zipper in an upright position. UV50+ protection from the sun's harmful UVA and UVB rays. SIZING: MEDIUM | 4 Years | 22" Chest | Weight Capacity: 33-45 lbs. LARGE | 4-6 Years | 25" Chest | Weight Capacity: 45-60 lbs.