Personalized 13th Anniversary Robot Couple T-Shirt. 13th Anniversary Retro Robot T-Shirt - Purple gift for him has 13 years and she still jiggles my bolts message. Everyone loves our Custom T-Shirts! 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.