The Pet Life ® 'Apex' Lightweight Stretch and Quick-Drying Dog Coat is engineered to provide Year-Round comfort and support and features a concealed hood that zips then pops out of the collar. The Apex is geared with a Dual-Fibered Exo-Shell that when combined creates a lightweight heating and cooling system with a complete full-range of mobility. The Outer-shell is composed of a lightly-lined fabric that's Windproof, Water-Resistant, Quick-Drying with a secondary elastic or flexible fabric along the rib areas that's further Breathable and Impermeable and offers Strategic Ventilation and reacts to weather, engineered to keep the body Cool during the Spring and Summer by wicking away moisture and providing warmth in the Fall and Winter. The stretchy material is also designed to create a perfectly tailored fit around the torso and chest that feels like a secondary skin. Equipped with Above-Top zippers and reinforced-stitching for added durability. This Dog Coat is also great for travel and folds right into an included pouch. Machine Washable. 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