Shirt exchange is available on race day at the merchandise store. After race day, we can exchange your shirt upon request, but you must cover the cost of shipping. Shirt sizes are not guaranteed after regularly scheduled packet pickup dates. Shirt exchange requests must be made within 2 weeks following the event. The size that was selected when you registered was what we ordered. Our race tees are a unisex cotton/poly blend that can be considered an athletic fit. If you like a looser fit, we suggest ordering a size up.