The Pet Life ACTIVE 'Warf-Speed' Heathered Tone-on-Tone T-shirt features a Yoga-like 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 is also UV Protect-ant 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"