Our Big Sister tank is made from super soft cotton with a touch of lycra making these the most efficient are compatible in the marketplace. Made in the usA. 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), Huge 16-19″ (19-30 pounds), XLarge 20-23″ (31-forty five pounds), XXLarge 24-28″ (46-64 pounds).