Personalized I Love My Sister Bright Rainbow T-Shirt. Made with love, this "I Love My Sister" Bright Rainbow design is a perfect way to celebrate your sister and the love you share. It's a cute and funny way to show your appreciation for your little sister or to celebrate your perfect little sister's birthday. No matter the occasion, this design is a heartfelt way to express your love for your sister and make her feel special. 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.