The Pet Life 'Ultra Fur' Collared Metallic Dog Jacket is Composed of High-Grade Sponge Polyester Outer-Shell and Comfortable Fleece Inner Lining. This Dog Coat contains Thinsulate Thermal Heat Retention Technology specially inserted between the fabrics keeping your Pet Warmer during those Colder Weather Climate conditions. The Faux Fur collar contrasts this Pet Jacket nicely. The Belly Velcro's into place easily creating easy On and Off access. Available in Multiple Sizes. Sizing Guide: From Back of Neck to Tail area (""In"" Inches) 8"" : EXTRA SMALL 10-12"": SMALL 14-16"": MEDIUM 18-20"": LARGE 22-24"": EXTRA LARGE