This fantastic "Big Dog" T- Shirt is made out a Cotton/Lycra Blend. It is embossed with gun metal lettering and is machine washable. Sizes: Big Dog X Small: 30-45 Lbs. or 20-24 inches. Big Dog Small: 45-60 Lbs. or 24-28 inches. Big Dog Medium: 60-80 Lbs. or 28-34 inches.