I bought this for baby swimming, but I'm selling it because I ended up using a different swimsuit. Only tried on over underwear. Brand new, unused. Retail price: 5500 yen ■ M size: 6 months ~ 18 months (Chest: 48cm / Length: 41cm) ■ Reliable insulation This swimsuit was developed in response to requests from swimming schools for a swimsuit with high insulation to keep babies warm. Made of 1mm thick, flexible wetsuit material, it is designed to keep babies warm and comfortable in the water. Babies tend to feel cold faster because they can't move around actively in the water like children over 3 years old. ■ Excellent UV protection With the highest standard UPF50+ processing, you can also use it as a rash guard for water play at home or at nursery school. ■ Surprisingly easy to change The fully openable design makes it easy to change clothes for a baby who moves around. Also, the soft finish that fits comfortably on the body is an ideal structure for the baby's body. ■ Adjustable size The size can be adjusted with the Velcro on the shoulders. ■ Safe for children with sensitive skin! It keeps protective cream from coming off, so it's safe for children with sensitive skin. ■ Safe because it's non-slip even when wet & hard to come off The moderate stiffness of the wear makes it easier to hold a baby who moves around, so parents can feel safe. Also, it is designed to be difficult for toddlers to take off while moving around in the water or on the poolside.