Kaytee Comfort Harness with Stretchy Stroller Leash is the safest and most stylish way to walk your favorite furry friend! The Comfort Harness is designed to comfortably conform to your critters contour. Comfort Harness is machine washable and made of a Durable Nylon Material Velcro straps make fitting remarkably easy E-Z snap buckle ensures a safe and secure connection on the harness and Includes a Stretchy Stroller Leash Assorted Colors - Blue Green Red Tan Brown and Silver - let us pick a color for you! The unique harness and Stretchy Stroller ensures your pet cannot get away from you yet its elasticity helps prevent injuries to your pet while being walked. Comfort Harness Sizing: Small (Neck 5-7 and Waist 7-9 ) - Fits ferrets and rats Medium - (Neck 7-9 and Waist 9-11 ) - Fits rats guinea pigs and ferrets Large - (Neck 10-13 and Waist 13-16 ) - Fits ferrets dwarf rabbits rats and chinchillas X-Large (Neck 10-13 and Waist 16-18 ) - Fits large rabbits and chinchillas.