Is my life jacket correct? Life jackets come in sizes to fit babies through large adults. When worn correctly, they work! Should fit snug around the chest and should not ride up on your body when in the water. Straps should be pulled tight and not twisted. A Richland County Health Department Prevent. Promote. Protect. Check for a weight limit on the inside. Use the correct size based on weight. All buckles should be fastened. Some smaller life jackets have a strap between the legs, too. Be sure to fasten that for extra protection. Is my life jacket correct ? Life jackets come in sizes to fit babies through large adults . When worn correctly , they work ! Should fit snug around the chest and should not ride up on your body when in the water . Straps should be pulled tight and not twisted . A Richland County Health Department Prevent . Promote . Protect . Check for a weight limit on the inside . Use the correct size based on weight . All buckles should be fastened . Some smaller life jackets have a strap between the legs , too . Be sure to fasten that for extra protection .