what should you look for when shopping for an ergonomic office chair?

what should you look for when shopping for an ergonomic office chair?  

•  The backrest should be adjustable so it can support your spine while you sit up straight.
• It should have enough padding so that you won't feel pressure points on your back or bottom after sitting for long periods of time.
•  It should be breathable so you don't get too hot while working in front of the computer

https://www.radianergo.in/