Men's I Run Because Punching People Is Frowned Upon T-Shirt - Workout Shirt Workout shirt, perfect for running, lifting, yoga, squatting and all other exercises. Blend of polyester & viscose. Extremely soft, lightweight and durable. High quality racerback flowy tank top. Available in 4 sizes (S/M/L/XL) & several colors. True to size. If between sizes we recommend a size down. Designed and printed in the USA by Constantly Varied Gear.