For developing skills in intermediate swimmers, Poolmaster's Butterfly Swim Vest is comfortable and is made of 100% Polyester fabric surrounding a closed-cell foam interior which aids in buoyancy. The beautifully designed vest features an easy-glide zipper with tab-top closure. Removable briefs easily snap on or off as desired. Recommended for ages 1-3 years or weight between 24 - 40 lbs. Swim in confidence, comfort, and style!.