Size: M: Chest circumference: 43-63 cm. Neck circumference: 40-48 cm. Choose the appropriate size: This life jacket is suitable for small, medium, and large dogs. Measure your dog's chest and neck circumference, especially the chest circumference. If the measurement is close to the maximum size, choose the larger size for optimal comfort. ULTRA-DURABLE MATERIAL AND QUALITY CONSTRUCTION: This life jacket is made of ripstop cotton with a pearl pattern. It provides plenty of buoyancy in the water and does not restrict your dog's movements on land. It has breathable mesh under the belly for good water drainage and quick drying. Safe and reliable: Robust and comfortable Velcro system at the stomach and neck for a secure fit. Bright colors and reflective strip for better visibility. You can quickly spot your dog, whether it's in or out of the water. PRACTICAL AND ADAPTABLE: Adjustable straps and quick-release buckles ensure a perfect fit and keep the vest securely in place on the dog in the water. A robust, discreet handle on top provides easy and quick access, facilitating retrieval of the dog in an emergency. The D-ring can be used to attach a leash.