Our Big Brother tank is made from super soft cotton with a touch of lycra making these the most efficient have compatibility available on the market. Made in the united statesA. Clothing Sizing is the measurement from the neck to the bottom of the tail. Weights are approximate. XXS 5-7″ (1-2 pounds), XS 8-10″ (3-5 pounds), Small 10-12″ (6-8 pounds), Medium 12-15″ (nine-18 pounds), Massive 16-19″ (19-30 pounds), XLarge 20-23″ (31-forty five pounds), XXLarge 24-28″ (46-64 pounds).