Personalized 1st Birthday Monkey T-Shirt. Our 1st birthday monkey design apparel and gifts are perfect for any wild one-year-old who loves jungle animals and monkeys. The playful and colorful designs are sure to bring a smile to everyone's face and create lasting memories of this milestone 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.