Water Confidence - These products provide the tools to build confidence for a child already familiar with the water and learning to swim, UV50+ Block the Burn protection from the sun's harmful UVA and UVB rays. Soft, durable neoprene construction for warmth and buoyancy. Full Front zipper for easy on and off, Safety closure helps secure the zipper in an upright position. Soft polyester inner lining for comfort, Safety strap with buckle closure. Bright, fun all-over graphics. Great teaching tool for beginning to swim and building water confidence. MEDIUM: Ages 2-4 Years | Weight Capacity: 33-45 lbs.LARGE: Ages 4-6 Years | Weight Capacity: 45-60 lbs. SAFETY NOTE: THIS IS NOT A LIFESAVING DEVICE. DO NOT LEAVE CHILD UNATTENDED. USE ONLY UNDER COMPETENT ADULT SUPERVISION.