Personalized Mouse Long Sleeve T-Shirt. A great finder, a great helper, and a great friend. Mouse Long Sleeve T-Shirt - White from "Dog and Mouse" by Michelle Nelson-Schmidt wants to help, not because she has to, but because she wants to. Pre-shrunk 100% cotton 6.1 ounce long sleeve t-shirt. Double-needle stitched neckline and sleeves. Quarter turned. Shoulder-to-shoulder taping. Adult: S, M, L, XL, 2XL, 3XL