Those are not custom (typically come pre-sized) and are generally not very usable outdoors to get around other than short distances. Sometimes known as "hospital wheelchairs". For people with temporary injuries who are mostly taking time off from work it's fine.

This is a everyday wheelchair that people can use to get to somewhere a mile or two away and back, often used by people to get to work or around a university campus independently. It is custom made to your measurements: https://notawheelchair.com/pages/configurator

https://www.sammcintosh.com/blog/wheelchairtypes0620