Size: M - Chest Girth: 43-63cm, Neck Girth: 40-48cm PLEASE CHOOSE A SUITABLE SIZE: Izefia life jacket is suitable for small dogs, medium dogs and large dogs. There are 7 sizes, from XXS to XXL. Please measure your dog's chest and neck girth, especially the chest girth. If the measurement is close to the maximum, please choose the next larger size for a more comfortable fit for your dog. EXTRA DURABLE MATERIAL AND EXCELLENT WORKMANSHIP: The life jacket is mainly made of beaded ripstop cotton ripstop material. It provides sufficient buoyancy in the water and does not restrict your dog's movements on land. It features an advanced breathable mesh bottom for good drainage and drying. SAFE AND RELIABLE: Durable and more comfortable velcro system around the belly and neck to keep it securely fastened. Bright safety colors and reflective tape can improve visibility, you can quickly identify your dog in and out of the water. CONVENIENCE AND ADAPTABILITY: Adjustable straps and quick release