The Pet Life ® Active 'Hybreed' 4-Way-Stretch Fitness Performance Dog T-Shirt is crafted and Engineered with a specially formulated Ultra-Lightweight and well Ventilated elastic fabrics that enhance Performance, Mobility and Breath-ability. Features 4-Way Stretch Construction that moves better in every direction with a relaxed fit. Both infused fabrics feature a specially formulated Micro-fiber that contains perforated micro-mesh panels that offer surround ventilation. This soft-to-the-touch material almost feels like a secondary layer of flexible skin and feature Quick-Drying properties that both repels body moisture or sweat while offering Anti-Odor technology that assists with odor causing microbes. Great for Fitness and Dog Yoga activities - the Hybreed T-shirt also offers UV Protection against the suns harmful rays and fitted perfectly to help assist in containment of shedded hairs. Features Dual Reinforced stitched hemming at every seam for longevity and durability with a Pull-Over design for easy on and off access and Reflective-Taping 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 - 13.5" Neck - 9.5" Sleeve - 6.5" SMALL - Back - 11.5" Chest - 16.5" Neck - 12.5" Sleeve - 7" MEDIUM - Back - 14.5" Chest - 20.5" Neck - 14" Sleeves - 7.5" LARGE - Back - 18.5" Chest - 25.5" Neck - 16.5" Sleeve - 8" EXTRA LARGE - Back - 21.5" Chest - 30.5" Neck - 19.5" Sleeve - 8.8"