The Dog Helios ® 'Hurricanine' Waterproof and Reflective Full Body Dog Coat is Inner-lined with exclusively developed Heat Reflective Technology that is engineered to reflect back body heat back into the body. The Micro-Stitched Exterior shell is completely waterproof and doubles as a Wind-Breaker. The Inner-Lining also features Blackshark Technology, this innovative fabric is Lightweight, Waterproof, Windproof, Snow proof, Breathable, Cold-Repellent and Tear Resistant and engineered and tested to withstand the most extreme winter weather conditions. This jacket is further extremely lightweight with complete comfort in mind. The design features surrounding 3M Reflective Tubing with added reflective taping for emergency night visibility. Additionally these Hurricanine dog coats feature adjustable straps by the waist area and adjustable Heavy-Duty Velcro Straps by every sleeve for a customized fit while preventing the frigid cold weather from entering the body. This jacket also features a Dual-Zippered Waterproof Leash Slit below the collar and auto-adjustable built-in inner tubed lining for an out-growing fit. Also features an above-top Waterproof Zippers for convenient on and off access that completely prevents any wind from entering while preventing any pulling of the dog's hair. We've looked into everything when engineering this jacket. Get Outdoors with Dog Helios! Available in Multiple Colors and Sizes. SIZING SPECIFICATIONS - In (Inches) "Back" Length is from Neck to Tail - * See image chart for sizing approximation EXTRA SMALL - Back - 8.3" Chest - 17.7" Neck - 12.2" SMALL - Back - 11.8" Chest - 21.7" Neck - 13.8" MEDIUM - Back - 15" Chest - 24.4" Neck - 15.7" LARGE - Back - 18.9" Chest - 29.9" Neck - 16.9" EXTRA LARGE - Back - 22.8" Chest - 34.6" Neck - 18.9"