Material: Compression vest is made of 95% polyester and 5% spandex, hand and machine washable Our sleeveless shirts are compression fit, if you want a looser fit, we recommend you choose one size larger Girls' Tank Tops: Breathable, moisture-wicking fabric keeps your child cool and dry while enjoying activities Boys Compression Shirt: Muscle fit shirt reduces muscle fatigue and injury. The compression fit improves blood circulation and oxygen supply to the body, suitable for your little adventurer to play freely and comfortably. QUICK-DRYING FABRIC: A unique four-way stretch design provides flexibility and comfort, and features advanced moisture-wicking technology to ensure you stay dry during intense activity. Scene: Designed for boys and girls, this youth compression shirt is suitable for a variety of activity scenarios, such as: running, gym, football, basketball, baseball, softball, hockey, hiking, allowing your child to unleash their potential and enjoy sports. 1. Gender: boy and girl 2. Our Boys Compression Shirt It's made from 95% polyester and 5% spandex, with flat-lock seams to prevent irritation for a chafing-free fit and a soft touch for your little adventurer. 3. Moisture wicking keeps you dry during exercise, and the four-way stretch fabric has high compression fit. 4. This youth compression shirt blends functionality and fashion, choose the comfort and style that suits your child's adventures, perfect for football, basketball, gymnastics, running, hockey, baseball, biking or outdoor activities 5. If you like to choose a loose fit for your child, we recommend you choose the next size up