[Size]: S (neck 27-33cm, chest 39-48cm, weight 3-6kg); M (neck 34-38cm, chest 50-64cm, weight 6.5-16kg); L (neck 39-52cm, chest 62-78cm, weight 16-27.5kg); XL (neck 53-74cm, chest 74-94cm, weight 27.5-45kg). [Breathable]: Made with a lightweight and breathable mesh lining to improve comfort and breathability. This dog harness for small dogs is perfect for walks, hikes and runs all year round. The harness wrap structure designed to provide comfortable and safe walking for your dog. No more bail and suffocation of distribution pressure. [Simplify Wearing]: Our sturdy pet harness features 2 quick release buckles on both sides for easy on and off. 2-step design to put on/off the harness in seconds. Put the dog's front feet into the hole, lock the binding, done. And adjust 2 clips on the right side of the harness to provide a reliable fit. [Adjustable]: This adjustable harness includes 4 easy adjustment straps around the body. You can use its 2 neck straps and 2 chest straps to create a perfect fit for your dog with some room to grow. Perfect for daily walking, running, hiking, working out, hunting, outdoor adventure and more [Reflective Strip Design]: The dog walking harness has a unique reflective strip design, which can alert pedestrians and vehicles when you walk your dog at night, protecting your dog.