Sea Squirts SwimWays Swim Assist Vest (Yellow, Small) Graduated swim training vest for kids with a back fin that is fun to wear! 4 flotation pads inside the vest allow you to customize the support your child needs Simply remove the pads to gradually ease your child forward into a proper swimming position Back fin folds back so your child can sit comfortably Recommended for ages 4-6, with a 22-24" chest measurement