Description Medium 23-25 inch chest, 30- 50 pounds. Swimways Sea Squirts Life Jackets are fun and kids love to wear them. They are easy to zip and clip and are shipshape enough to qualify as a ski vest or wake-boarding vest. They are U.S. Coast Guard certified as a Type III Personal Floatation Device. The arm-hole sizing insures a proper comfortable fit so the strap between the legs doesn't have to be too tight. Sturdy Grab Me Fin and professional neoprene construction make this a comfortable and fun life jacket for kids. Patent and Patent Pending. Sea Squirts Life Jacket Size Chart SizeChest MeasurementWeight Small 20-23 inches 30-50 pounds Medium 23-25 inches 30-50 pounds Large 25-29 inches 50-90 pounds. Features & details: They are fun and kids WANT to wear it. Sea Squirts look like fish for a serious reason. Each design has a flexible fin on the back to help kids get carried away with creative play. It's a brand new idea and there's nothing like Sea Squirts on earth. Swimways Sea Squirts Life Jackets are Type III U.S. Coast Guard Approved Personal Flotation Devices Fin folds over when leaning back for active use The arm-hole sizing insures a proper comfortable fit so the strap between the legs doesn't have to be too tight. Grab me fin can be used as swimming aid Product Details