The Pet Life ® Active 'Chase Pacer' Medium-weight 4-Way-Stretch Yoga Fitness Dog Tracksuit features a Performance system that offers Year-Round comfort that both Cools and Warms the body. Heavy enough in the winter and Breathable during the summer. Features both Medium and Lightweight blended performance Quick-Drying Cotton that is Nano-Stitched and features 4-way Stretch construction that moves better in every direction. Perfect for Fitness, Performance and Dog Yoga Activities. Additionally the Chase-Pacer features an extremely flexible Medium-weight secondary breathable fabric mapped across the sides and legs for added strategic ventilation and added flexibility for increased Mobility. Fused together this creates a breathable ecosystem with stretch ability. Features expandable fit with stretch-banded lining that enables increased room for growth around the body and on each sleeve for a customized fit. Both materials repel perspiration while offering Anti-Odor technology that assists with odor causing microbes. Offers UV Protection against the suns harmful rays and fitted to help assist in containment or collection of shedded hairs. Design features Dual Reinforced stitching at every seam for Durability and a leash-slit along the backside with a sided above-top zipper for convenient on and off access with Reflective Tubed stitching for added night visibility. Machine Washable. This style is part of our Pet Life ® Activewear Collection. Available in Multiple Sizes and Colors. SIZING SPECIFICATIONS - In (Inches) "Back" Length is from Neck to Tail - * See image chart for sizing approximation EXTRA SMALL - Back - 9.5" Chest - 15" Neck - 12.5" Sleeve - 3.9" SMALL - Back - 11.5" Chest - 18.3" Neck - 14" Sleeve - 4.3 MEDIUM - Back - 14.3" Chest - 21.3" Neck - 15.5" Sleeves - 5" LARGE - Back - 18.3" Chest - 26" Neck - 17.8" Sleeve - 6.1" EXTRA LARGE - Back - 23" Chest - 32" Neck - 20" Sleeve - 7.1"