Feature: 1. Ergonomic support cartilage lumbar support: According to professional research, a new type of technology is introduced to create an ergonomic bone support lumbar support. The built-in airbag air energy adjustment design fits the waist comfortably. 2. Safety air valve: The safety air release valve is ingeniously designed to facilitate air release and is not easy to be damaged. 3. Relieve discomfort: Help to improve sitting posture, maintain the natural curve of the spine, and reduce the symptoms of lumbar discomfort. 4. Provide support: The integrated airbag facilitates adjustment of the thickness of the lumbar pillow, reducing waist discomfort and back strain. If you sit in office chairs, gaming chairs and driving cars for a long time, this lumbar pillow will provide perfect support. Specification: Material: TPU airbag/sandwich mesh/PVC bone strip Butterfly: Size: about 38*39*1.5cm, after inflation: about 8cm Round package size: about 40*7*7cm Gross weight: about 420g/pcs Rectangle: Size: about 38*28*1.5, after inflation: about 8cm Round package size: about 29*7*7cm Gross weight: about 310g/pcs Package includes: Package List: Note: Due to the lighting effects and shooting angles, there is color difference in the product, please understand.Due to manual measurement, there is a tolerance in the product size.