Before you choose and pay for an office chair, keep in mind a few things. An office chair is like an office assistant. A comfortable chair can let you do your job with ease. Get a chair that you can adjust according to your height. While sitting on the chair, your thighs should be parallel to the floor. Make sure the chair you are going to get has a pneumatic lever. With this lever, you can increase or decrease the height of the chair.
It's a good idea to buy a chair with good armrests. They will take some strain from your shoulders and neck. You can also buy good quality office chairs by browsing at http://kcchairs.com/product-category/office-chairs-toronto/
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Make certain the armrests are adjustable. That way you won't need to slouch over and over to place your arms on the table for rest. Last but not least, make sure the chair you buy is mobile. You should be able to move around without any problem. Check the chair if you can move its backrest backward or forward.
While working you may need to tilt forward to focus on the documents lying on the table. If the backrest is adjustable, you can make it move along as you tilt. In the same way, the backrest should move along when you move the back backward in order to rest. The office chair you buy should provide lumbar support. It should keep your lower back slightly arched, so you can avoid slumping while sitting.