Personalized Unicorn 4th Birthday Adult Sweatshirt. A cute unicorn with wings, a colorful mane and tail, and wearing a gold crown stands on a rainbow by a golden 4. Cute 4th birthday gift. Stay warm and stylish with this classic adult sweatshirt, perfect for everyday comfort. Crafted from soft, durable fabric, it features a relaxed fit for added coziness. Whether you’re lounging at home, running errands, or enjoying outdoor activities, this versatile sweatshirt is a wardrobe essential for any season.