No adult is exercising in a heavy cotton shirt these days, neither should kids! Designed for every day wear, the practice shirt can be worn to school and to the most intense sports or backyard play. Made from a sustainable recycled nylon, this shirt is moisture wicking, durable and has a creamy, breathable feel. If in between sizes, we recommend sizing up in shirts, dresses & pullovers. See size chart for more detail. Measurements taken on garment, laying flat. Practice tees run a little larger and we suggest sizing down if in between sizes. UV Protection with SPF 50. Bluesign and Oeko-Tex Certified. Machine wash on cold and tumble dry low.