The Petsafe Come With Me Kitty Harness gives you gentle, comfortable control of your cat or kitten, while allowing her to explore the world outside your door. The patented design allows for a gentle pressure on the leash to cradle your cat as you walk, restraining forward motion without harsh pulling or discomfort. The adjustable sternum slide allows you to create a custom fit for your cat's body type, while the dual adjustment points on the girth strap allow a snug, safe fit. The shoulder straps glide through the two D-rings on the back, allowing an increase of tension (when needed) to restrain your cat without choking. The elastic bungee leash provides a little extra "give" to soften the effect of kitty reaching the end of the leash while walking. For the best possible fit, always measure your cat to get the right size. Measurements: Small: 9-11 in. girth; Medium: 10.5-14 in. girth; Large: 13-18 in. girth.