XXSmall-XSmall size. Minimum user weight 41 Kg. There are marks over the gilet but all straps are sound and clip in securely, zip works well. Check photo of sizing before buying. Buoy-O-Boy Child’s Life Vest is a vintage 80s flotation jacket in the shape of a gilet jacket, designed for children with chest sizes between 61 to 81 cm and weighing over 41 kg. The bright orange colour makes it easily visible in the water, providing safety and support for young swimmers. This item falls under the category of Floats & Inflatables in the Swimming and Sporting Goods section. Buoy-O-Boy is a trusted brand known for its quality flotation devices.