Personalized Horseback Riding Horse T-Shirt. Horseback rider gift idea says when I'm riding I'm happy with horseshoe design silhouette 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.