The Touchdog ® Mount Pinnacle Insulated Performance Retro Ski Dog Jacket features a Tough Polyester Water-Resistant treated outer-shell that is further Windproof and Weather-Resistant. Interior features comfortable Polar Fleece which gently hugs the body and Inner-Lined with Poly-fill making this jacket both lightweight and durable. Great for the Outdoors! Features triple accented coloring at the outer-shell with Heavy-Stitched Embroidery by the back-side and hooded areas. Available in Multiple Sizes and Colors. 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