Personalized Helping? That's my favorite and very best skill!- Mouse Long Sleeve T-Shirt. Great helpers come in all shapes and sizes. Helping? That's my favorite and very best skill!- Mouse Long Sleeve T-Shirt - White, perfect for fans of "Dog and Mouse" by Michelle Nelson-Schmidt. 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