MEDIUM SIZE- Medium Chest Girth:11-13"(28-33cm ),Weight:6-10 lb(3-4.5kg).It\s suitable for most cats puppies and small animals.Please measure your cat carefully and refer to the size chart before order,including : cat harness and lead set(Nylon Leash 150cm)SOFT BREATHABLE MATERIAL- the vest harness Made of lightweight,breathable mesh,padded,wrap-around chest back,keep your Pet comfortable no deformation after wash,prevent NO pulling and choking and to protect the cat fragile neck from without pain.ULTRA-LIGHTCat vest harness is less than 71g, the same weight as a car key. Your cat is free to walk after wearing and absolutely likes it,material that doesn\t overheat when it gets hot and retains heat in the winterESCAPE PROOF OUTDOOR HARNESS - This real comfy small pet harness,the chest girth is adjustable which allow a just-right fit for your flexible cat and both sides have a sturdy Safety Buckle,Suitable for daily walking,jogging,training,and any outdoor recreations,activities.EASY ON AND OFF- This Step-in cat harness is simple to put on and take off with back buckle and magic tape.two heavy duty D rings can attach leash when you take a walking and training.Super easy to use,Please feel free to contact us if you have any question.