EverTrust(TM) Fashion Soft Nylon Mesh Small Pet Harness Step-in Breathable Dog Cat Pull Harness & Leash Walking Safety Strap Vest Clothes -Breathable air-mesh fabric to keep your dog cool and dry in the summer. Also very light weight with velcro and plastic clip closure and two heavy duty D-rings for added security. You will love these vests -This vest is so comfy for your pet and a breeze to put on and take off. This choke free harness has no thin straps to dig in and hurt your pet and is washable for easy cleaning This vest is a great value compared to the more expensive brands and is made with the same quality materials. -Please Note: These vests do run small (my 7-8 lb yorkie with long fur fits into a medium size fine) small would not work for him. All breeds are different so please measure your dogs chest first and refer to our fitting sizes below. The velcro strap will adjust about 1 to 2 inches. -FITTING INSTRUCTIONS/SIZES: (Please measure your pets chest just behind the front legs and up to the top (back) with a measuring tape or string for correct fit) The S size will fit less 3kg dogs good but not , just depends on the breed. -These vests are for smaller dog breeds,If you have any questions before or after you buy the product ,feel free to contact with us ,communication is the best way to resolve the problem .We will make sure you and your pet are happy.