Comfort Harness & Stretchy Stroller Leash, Medium The Medium Comfort Harness and Stretchy Stroller Leash are the safest and most stylish way to walk your favorite furry friend! * The Comfort Harness is designed to comfortably conform to your critter"s contour. * The adjustable small size fits small ferrets, guinea pigs and other smaller critters. * Comfort Harnesses adjustable Velcro straps make fitting remarkably easy, while the E-Z snap buckle ensures a safe and secure connection on the harness. * The Comfort Harness comes complete with a 6 foot Stretchy Stroller Leash made just for small animals.