The Pet Life Fashion Parka Dog Coat contains Thinsulate Thermal Heat Retention Technology has an inner shell specially inserted between the Fabric. This Pet Coat Features matching Tone-on-Tone Inner Fleece Fabrics for additional Warmth and Comfort. This Dog Jacket Features a Faux Fur Removable Zip-Off Hood and Usable Back Pockets.This Coat will keep your pet warmer during those Harsher Cold weather conditions or climates. In addition this Pet Coat Features Belly-Velcro closures for easier On and Off access. Available in Multiple Sizes and Colors. 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