DuDuHome Nylon Dog Life Preserver with Custom Gift Matermail:Oxford Cloth,breathable mesh Back:45cm/17.72inches;Chest:72-95cm/28.35-37.40inches;Neck:48-58cm/18.90-22.83inches Please understand that there is no standard sizing system for pet clothing. Please measure your pet and compare to the chart provided as each brand and style of pet clothing has its own sizing system. Attention:This is a swimming aid. Do not leave pet unattended.Manual measurement, allowing 1-3 cm error Feature:Detachable pillow headrest with locking zippers,can adjustable