Personalized 1st Birthday Monkey T-Shirt. Our 1st Birthday Monkey design is perfect for your wild one's special day. The playful monkeys and other jungle animals will add a fun and festive touch to the celebration. 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.