Personalized Shamrock and Hearts St Patrick's Day T-Shirt. Celebrate the luck of the Irish with the Shamrock Hearts T-Shirt - Green. This playful combination of shamrocks and hearts brings a touch of love and luck to your St. Patrick's Day festivities. 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.