UV 50+ protection from sun"s harmful UVA and UVB rays. * Lightweight swim aid provides full flotation while teaching kids swim techniques. * Made of soft and durable neoprene. * Form fitting, sleek design promotes greater mobility.Front zipper for easy on and off and under-leg strap for security. * M: Fits 2-4 year olds/Chest measurement up to 22 inches/Weight: 33-45 pounds; L:Fits 4-6 year olds/Chest measurement up to 24 inches/Weight: 45-60 pounds.