The Dog Helios ® 'Rufflex' Mediumweight 4-Way-Stretch Fitness Yoga Dog Tracksuit Jacket was developed with premium Comfort and Flexibility in mind. The entire body features a specially configured Medium-weight elastic material that both cools and warms the body for year-round flexible comfort. This specially blended fabric features high-level properties of Flexibility for unrestricted Mobility and is also extremely Breathable and Permeable. Great for premium performance, fitness and dog yoga activity. The Exo-shell features 4-way stretch construction that moves in every direction. This dog jacket and tracksuit also features banded elasticity around the sleeves and across the body for a nice almost tapered relaxed fit with added room for growth. Features Dual-Reinforced stitching at every seam for Durability with added reflective taping for night protection. Additionally, this tracksuit features Quick-Drying technology that dries rapidly while offering Anti-Odor technology that prevents odor causing microbes. Assists with UV Protection against the suns harmful rays and fitted perfectly to help assist in containment or collection of shedded hairs. Features a fashion collar with a leash-slit along the back. Machine Washable. 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 - 9.8" Chest - 15.4" Neck - 11.4" Sleeve - 2.8" SMALL - Back - 11.8" Chest - 18.1" Neck - 12.6" Sleeve - 3.1" MEDIUM - Back - 13.8" Chest - 20.1" Neck - 14.2" Sleeve - 3.5" LARGE - Back - 15.7" Chest - 21.3" Neck - 16.5" Sleeve - 3.9" EXTRA LARGE - Back - 17.7" Chest - 23.2" Neck - 17.7" Sleeve - 4.3"