Active youth need a heavyweight T-shirt like Jerzees Youth 5.6 oz. 50-50 Heavyweight Blend T-Shirt. Made of 50% cotton and 50% polyester, it is far less prone to shrinking than its all-cotton counterparts. The combination also makes for a durable fabric that will hold up throughout the season. Expect a good fit with shoulder-to-shoulder tape and double-needle stitching.