Onyx US Coast Guard Approved. In addition to chest straps, this life vest has a strap that comes from the back to the front, keeping it secure while in the water. User weight: 30-50 pounds. 20"-25" chest. Keep your young child safe while playing the water. This is a Type III PFD. Type III PFD's provide good support to children with some swimming skills. CHILDREN SHOULD NEVER BE LEFT UNATTENDED IN OR NEAR THE WATER WITH OR WITHOUT A PERSONAL FLOTATION DEVICE (PFD). If your child needs a larger vest, please contact us to see if we have the appropriate size.