Personalized Engineer Three Shamrocks T-Shirt. Celebrate the wearing of the green with this three shamrocks and Engineer text design. Unique gift on birthdays, graduations and holidays for the Irish and the Irish at heart. 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.