Personalized Irish At Heart T-Shirt. St. Patrick's Day T-Shirt - White with a heart shaped shamrock says IRISH AT HEART. You can be Irish too, even if it's only for the day. Perfect for family celebrations, St. Patrick's Day parades or any time. Wardrobe essential for looking good, 24/7. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar. Shoulder-to-shoulder taping. Double-needle stitched sleeves, bottom hem and front neck. Note: greys are a cotton/polyester blend.