ThermaFur Heating Dog Coat - MED-BLACK 100% polyester barrier fleece creates a water and wind proof garment for your canine Ideal for cold winter days, activates quickly and will last for hours Sizes: XS, S, M, L, XL, XXL Colors: Black Include HeatPax Mini Warmers, 8 Hour Duration (Size: XSmall - 1 pair, Small - 2 pair, Medium - 2 pair, Large - 3 pair, XLarge - 3 pair, XXLarge - 4 pair)