Personalized Jellyfish Jellies Sea Creatures T-Shirt. A school of jellyfish in pastel colors on a cute T-Shirt - Navy Blue sea creature themed gift, great for National Oceans Month. Everyone loves our Custom T-Shirts! 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.