Personalized Kawaii Whale Uncle's Sweetheart T-Shirt. Looking for a gift for a special little girl in your life? Look no further than this Kawaii Whale Uncle's Sweetheart design! Perfect for any little girl who loves whales, this design is sure to put a smile on her face. Plus, it's a great way to show your love for your niece or nephew! 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.