Size: S (neck 27-33 cm, chest 39-48 cm, weight 3-6 kg); M (neck 34-38 cm, chest 50-64 cm, weight 6.5-16 kg); L (neck 39-52 cm, chest 62-78 cm, weight 16-27.5 kg); XL (neck 53-74 cm, chest 74-94 cm, weight 27.5-45 kg).Respirant: Made with lightweight breathable mesh lining to improve comfort and breathability. This dog harness for small dogs is perfect for year-round walking, hiking and running. The harness shell structure designed to provide a comfortable and safe walk for your dog. No more bailing and choking on the dispensing pressure.Simplify the Port: Our heavy duty 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 in the hole, lock the fastener, finish. 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 growing room. Perfect for daily walking, running, hiking, training, hunting, outdoor adventure and moreReflective Strip Design: The dog walking harness has a unique reflective tape design, which can alert pedestrians and vehicles when you walk your dog at night, protecting your dog.