Personalized Kawaii Whale Mommy's Sweetheart T-Shirt. Looking for a gift for the kawaii lover in your life? Look no further than this adorable Kawaii Whale Mommy's Sweetheart design! This sweet design is perfect for any little one who loves whales, and is sure to make mommy's heart swell with 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.