I had a Koala chair too. Bought it when I bought my Koala sewing cabinet. Both way too expensive but anyway - the chair was very heavy and hard to push around in the carpeting provided in our apartment. After about 3 years, one of the thingys that held the wheels bent ( I think from running it over the carpeting ) Anyway, now I have an adjustable armless office chair with a very taut mesh back to let the air through. It's mostly made of a strong plastic, except for the seat and I love it. Got it at Staples. It's light enough for me to push back and forth while sitting in it. Fits me like a T.