The Pet Life ® Active 'Warf Speed' Heathered Ultra-Stretch Yoga Fitness Dog T-Shirt features a Dog Yoga complex performance structure comprised of premium blended stretchy fabrics with a sided strategic ventilation system with breathable Micro-panels that focus at the source of perspiration to help maximize Breath-ability during movement. 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. The top layer features a specially formulated stretchy elastic and breathable performance Micro-fibers that are also lightweight and stretchy. Features Quick-Drying properties that dries really fast that repels body moisture or sweat while offering Anti-Odor technology that assists with odor causing microbes. The Warf-Speed T-shirt also offers UV Protection against the suns harmful rays and fitted perfectly to help assist with containment of shedded hairs. Design features Dual Reinforced stitching 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"