Product Description This product is designed to be gentle on your dog's body, reducing strain on the neck and trachea, and providing a comfortable fit. The outer material is polyester, and the inner material is mesh, making it suitable for year-round use. The mesh itself has considerable cushioning, so it should fit gently even when pulled. Adjustment is easy with the Velcro and tape, allowing for a better fit to the body. Choosing the right size is very simple; just measure the circumference of your dog's chest. Easy to put on and take off. Simply put the front legs in and attach the Velcro and buckle on the back. The combination of Velcro and buckle provides excellent support, ensuring high safety. Chest size: 24 to 28 (presumably referring to inches or centimeters, but the unit is not specified)