Personalized Big Sis Groovy Heart Design T-Shirt. Celebrate the joy of being a big sister with this fun and groovy style. Featuring bold, playful lettering and a charming heart, this T-Shirt - Gold is perfect for showing off sibling pride. 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.