Personalized It's My Birthday Groovy Smiley Face T-Shirt. Bring the fun to your birthday with this colorful and groovy "It's My Birthday" retro smiley face design. Ideal for women, teens, and kids, this cheerful and lighthearted design will make your birthday even more memorable. Perfect for party goers who love the retro, hippie vibe, it adds a playful and unique element to any birthday celebration. 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.