DOG Heartbeat EKG Shirt I Love My Puppy T-Shirt Solid colors: 100% Cotton; Heather Grey: 90% Cotton, 10% Polyester; All Other Heathers: 50% Cotton, 50% Polyester Imported Machine wash cold with like colors, dry low heat Let everyone know you love your dog! We love our dog with every beat of our heart! Lightweight, Classic fit, Double-needle sleeve and bottom hem