Personalized Retro Groovy Mimi's Valentine T-Shirt. Show your Nana how much she means to you with this unique and groovy design that perfectly blends nostalgia with modern charm. It's a wonderful way to keep the family bond strong! 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.