Personalized I Have The Best Mom In The World T-Shirt. Gift her this unique piece and let her know she truly is the best. It's more than just clothing; it's a way to express your love and gratitude. 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.