The Dog Helios Extreme Softshell Performance Fleece Dog Coat is both comfortable and insulated through the body. This Coat is outer-lined with a Water-Resistant brushed-like softshell and reversed with Polar Fleece and further Inner-Layered with Exclusively Developed Backshark Insulation Technology - a thin inner layer that is Lightweight, Warm, Snow-Resistant and Impermeable -- for a complete warming system. Features a Neck Rise that extends to parts of the face covering much essential extremities with Dual Adjustable Jawstrings and adjustable in 4 different areas. Features elastic webbing throughout the length of the jacket that further seals out the cold with Reflective Tubing and Printing for added night visibility. Available in Multiple Colors and Sizes. General 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. Sizing Specifications: (In Inches). XS: 8.3" Length, 17.7" Chest Girth, 12.2" Neck Girth SM: 11.8" Length, 21.7" Chest Girth, 13.7" Neck Girth MD: 15" Length, 24.4" Chest Girth, 15.8" Neck Girth LG: 18.9" Length, 29.9" Chest Girth, 16.9" Neck Girth XL: 22.8" Length, 34.7" Chest Girth, 18.9" Neck Girth