Fits as expected, and has held up to multiple football practices so far! We will be getting more!I bought a small and medium for my two boys, 6 and 8. The 8 year old is in a size 10-12 and the medium was big on him. The 6 year old wears a 7/8 and the small was also big on him. I think these run a full size larger than expected.So far my 8 year old likes the shirt. I bought two, a blue and red. I bought them for hotter days while he plays and practices outside.This was a great purchase! Love the shirt and the way it looks on me, even though it fits a little on the loose side. Will order more, but maybe size down on the next order.This is supposed to be a compression shirt, but it’s even slightly too big as a regular shirt for my ten year old. I even used the sizing chart. He likes the design too much for me to send it back, so it will be a regular summer shirt for him, but I won’t be buying more.My son is a 5’7” swimmer and LOVES this shirt. He says it fits great, it comfy and really likes the pattern. What he really like is wearing it around the pool at swim practice. Swimmers aren’t know for wearing a shirt sleeve compression shirt but my son says he’s going to start the trend!From my perspective, this performance shirt is made of high quality material you’d expect from adult activewear. Can’t comment on the UV Protection as it’s winter here and haven’t had much sunshine but will add comments if needed.The material is great but my 7 yr old was swimming in this!Shirt is a perfect fit for my son and very comfortable fabric that he loves to wear year round. Ideal shirt for a active wear and he’s also planning to wear it with his baseball uniform. He also has the arm sleeves from Edge Sports and loves those.