The Dog Helios 'Vortex' Full Bodied Waterproof Windbreaker Dog Jacket features an Armor-like design. This dog coat features a Nylon-Polyester Blended outershell that is Waterproof coated, Tear-Proof and Medium-weight that is Heavy enough for the Winter and Light enough for the Spring. Lightly reversed with Anti-Static Polar Fleece. This Dog Coat features Reflective Tubing and triangular Reflective Printing across the backside. Fully adjustable around the chest area for a glove-like fit. Each sleeve features Hook-and-Loop enclosures for a perfectly tailored fit and to prevent wind or cold-air from entering. Available in Multiple and Colors. 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