The Dog Helios ® Octane Reflective Soft-Shell Neoprene Performance Dog Coat is Inner-lined with exclusively developed Blackshark Technology, this innovative fabric is Lightweight, Waterproof, Windproof, Snow proof, Breathable, Cold-Repellent, Impermeable and Tear Resistant. Features a Waterproof coated Neoprene-Satin Outer shell that with high elastic properties. Additionally the outer shell is 3M Reflective for added safety during night strolls. Great for the high-octane dog. The Interior of these dog coats are composed of Anti-Static thick Polar Fleece for added comfort and breath-ability. Features dual Velcro straps for convenient on/off access. This Dog Jacket also features accented Embroidery and a print on the Outer shell. Get Outdoors with Dog Jacket! 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