Grandson wears this under his martial arts uniform. It likes its breathability and body-hugging shape, but it's also very stretchy. Never feels restricted.

Grandson wears this under his martial arts uniform. It likes its breathability and body-hugging shape, but it's also very stretchy. Never feels restricted.

I tried to buy this for a thin adult but it really didn't fit him (XL). It is usually available in size S/M in adult clothing BUT that doesn't mean the product is bad, it's such a really good option and it looked sooo good, the quality looked great. Just wanted to post it so others know the sizes if they are thinking of an adult.

Bought for my 6.5 year old who is smaller (47 inches, 43 pounds). The XS fits him perfectly - meaning it fits snugly as intended. This is a slim/skinny fit so make sure you take this into account when choosing your size. This is a good t-shirt to wear when you exercise outside in cool weather.