Personalized Ketosis Butter Long Sleeve T-Shirt. Long Sleeve T-Shirt - Black for ketogenic dieters on a high fat low carb regimen says Ketosis You Had Me At Butter. Perfect for LCHF advocates. 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