The Dog Helios Extreme Soft-shell Performance Fleece Winter Dog Coat is both comfortable and insulated through the body. This Coat is inner-lined with a brushed fleece-like softshell that by nature warms the body with an additional inner-layer of Backshark Insulation Technology - embedded within the lining - that helps further warm the body. These dog coats Feature a Neck Rise that extends to parts of the face covering much essential extremities. Available in Multiple Colors and 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