Children's wetsuit, size M. Made of neoprene. Purchased about 2 years ago for around 2000 yen, but I forgot about it and it's now too small. I've attached images with the size information from when I bought it. It says 7-8 years old, but please refer to the actual chest size, etc., for reference. Good for sun protection, injury prevention, warmth, and also provides buoyancy, which is good for preventing accidents. I'll offer a small discount if you buy it with other items. Pool Sea Swimsuit Rash guard