The Pet Life ® Active 'Racerbark' 4-Way-Stretch Yoga Fitness Dog T-Shirt and Tank Top is comprised of a Lightweight and Stretchy Yoga-like Performance fabric that maximizes Mobility and Comfort. Features 4-Way Stretch Construction that moves better in every direction with a customized fit that's further than next to skin or Fur without the squeeze and won't bunch up. This specially formulated stretchy Micro-Fiber features a higher-grade of Elasticity that won't ever lose it's shape and is Permeable which provides Breath-ability. This Smooth-to-the-touch fabric features Quick-Drying properties that repels body moisture or sweat and features Anti-Odor technology that assists with odor causing microbes. The Racerbark Dog Tank Top is also UV Protectant against the suns harmful rays and strategically fitted to help assist in containment of shedded hairs. Perfect for fitness and Dog Yoga activity this performance dog t-shirt also features a Dual-Reinforced stitching at every seam for added 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 - 9.63" Chest - 12.75" Neck - 9.5" SMALL - Back - 10.63" Chest - 15.75" Neck - 12.5" MEDIUM - Back - 14.63" Chest - 19.75" Neck - 14" LARGE - Back - 18.63" Chest - 24.75" Neck - 16.5" EXTRA LARGE - Back - 21.63" Chest - 29.75" Neck - 19.5"