ENOVI Starfish Ball Chair, Yoga Ball Chair Exercise Ball Chair Ergonomic Design for Home Office Desk, Stability Ball & Balance Ball Seat to Relieve Back Pain, 24IN, WB

A little background -- I've tried *all the chairs*. I've tried regular office chairs, "ergonomic" mesh chairs with "lumbar support", old wooden chairs with a straight back, kneeling chairs (hurts your shins), a wobble cushion on a stool, and a yoga ball.And here's are the main four principles I've found: 1) that you need a stool with a surface that "wobbles" so that your butt/back can find the correct angle on it. 2) that the surface area contact has to be large enough so that the muscles over your "sit bones" (bones in your butt) don't get sore. 3) the chair itself has to be stable, and not roll around. 4) The seat needs to be adjustable-height.A wobble cushion on an adjustable-height stool is *great*, but sadly it breaks rule 2. After half an hour, your butt hurts. While a yoga ball provides much more surface area to fix that, but it breaks rule 3 -- even the ones that come with a ring base or plastic base roll around. The base will keep it from rolling around if the ball is sitting on it by itself, but put a person on it and it might as well not be there -- at least with a 75 cm ball.Turns out this is finally the perfect solution, the only one that does everything needed. It allows you to sit with correct posture because it's a yoga ball, it doesn't leave your butt sore because it's wider than a wobble cushion, and the metal base holds it firmly in place so it doesn't roll around.I'm shocked this is basically the only product out there that satisfies all constraints! But kudos to them for designing and manufacturing it. I've finally found THE CHAIR.Note: the sizes can be confusing. The large size is advertised as a 75 cm height (which is correct), but contains a 65 cm diameter ball. This is because the base itself lifts the ball up by 10 cm. Also note that you can inflate it to different amounts for different heights, so the large 75 cm size is actually more like a range of 70-80 cm.

The cover keeps coming off. Maybe it will work for older adults. My teenagers are using it for study and the cover keeps coming off. I don't plan to purchase another ball chair no time soon.

I am using the starfish ball chair in my classroom. My students love it and I love it! It's perfect for the students who need to wiggle. Once the students go home I use it!!

I got the medium size with a burgundy cover. The ball feels like a standard exercise ball in terms of material. The frame is sturdy and well designed. The cover is thick, tightly woven, and fits the unit like a glove. It doesn’t fell like it will ever pill, and its thick enough that it wont tear or rip easily.I am 5’3” and the medium size was a little too big for me - my feet don’t quite reach the floor with the wheels on.

Comfortable chair. They have amazing customer service. The ball of my chair popped, and that same day they responded and had a new chair sent to me.