The Shamrock Run participant T-shirt, which is included in your entry fee, is an adidas "tech fabric" T- shirt that is available in both men's and women's adult sizes. The shirt runs true to size. Here are the size choices:
Women's adult tech tee: XS, S, M, L and XL
Men's adult tech tee: S, M, L, XL and XXL
Sorry, but we do not have children's T-shirts in the adidas "tech" fabric. The children's T-shirts are 100% cotton.
The Shamrock Run sweatshirt also runs true to size, but is available only in men's sizes.