ATTENTION PLEASE:1. Please use soft tape to measure your dog and select the size based on chest girth (the widest part of ribcage).2. If between sizes, we recommend the larger one for more comfortable fit.3. Package Content: 1 X Dog life jacketMaterial: PolyesterSize Chart：S: Body Length: 25cm/9.8"; Neck Girth: 35-43cm/13.8"-16.9"; Chest Girth: 48-54cm/18.9"-21.3"; Product Weight: 256gM: Body Length: 30cm/11.8"; Neck Girth: 45-55cm/17.7"-21.7"; Chest Girth: 58-68cm/22.8"-26.8"; Product Weight: 300gL: Body Length: 34cm/13.4"; Neck Girth: 60-72cm/23.6"-28.3"; Chest Girth: 62-92cm/24.4"-36.2"; Product Weight: 400gDouble Quick-Release BucklesEquipped with adjustable straps and 2 quick release buckles, makes it easy to put on and take off.Easy-Grab Safety HandleSturdy grab handle on top makes it easy to guide your dog into and out of the water. A heavy-duty D ring for connecting the dog leash.Strong Hook & Loop Fasten SystemStrong hook & loop fasten system to assure custom fit specifically for your dog's chest, belly and neck.NoteFor dog's safety, please do not leave dog unattended while using a lifejacketWe recommend you to give your dog some time to get used to wearing this dog life jacket before using it in water