Product description Boys youth compression shirts 2/3/4 pack 4-Way-Stretch fabric Non abrasion spandex fabric with excellent elasticity and durability for maximum mobility. Chafe-free Flatlock Seams Smooth flat seams help reduce chafing. Crew neck The classic crewneck design is more comfortable Soft & Breathable Availalbe for All-Season: help to keep warm in cool conditions, while wicks moisture with a cooling effect in warm days Previous page Next page SIZE REFERENCE My son is nine and plays baseball. The shirts will be great for the early spring weather and chilly evening games. He tried them on and said the material is really soft and comfortable. ---Alex Ream Got large. For girl. Age 11. 5'4" 104 lbs . Fits exactly. Not loose. But didn't need to be. Wearing under jersey---- Michelle Gaddis I bought this for my son to wear for football. He loves it and says it keeps him so much warmer than the other shirt he was wearing. My son wears 12/14 and I bought him a large. Fits him good.---Sylvia My son is 12 and is 5'1" and 128lbs. I bought him a size xl, which according to the size chart, is a size 18-20 and fits kids 13-14 years old. My son normally wears a L to XL in youth tops. This shirt for him tight, which is how it's supposed to fit.---Erica