In all our enthusiasm about new products, we sometimes forget that the you cannot look inside our heads. We totally understand you have a few questions about the byAlex Sitting Balls. 

What is the best sitting ball size for my office?

The ball of 65 cm is ideal for the bigger kids and adults from 155 cm up to about 190 cm. Very suitable as a replacement for your office chair. Because your body automatically adopts the best posture, this ergonomic ball is ideal for your (home) workplace.

More specific information on what size of sitting ball you need is mentioned in a separate blog. Please follow the link.

In general a 65 cm sitting ball is the most used size of the balls. The height of a standard desk or kitchen table varies between 68 and 80 cm. We recommend to use the 65 cm ByAlex sitting ball. The ball will sink in a little when you sit on it and will then reach a sitting height between 50 to 55 cm. You have a more active sitting position compered to a standard (desk) chair.  

The cover seems too big for the ball, how is this possible?

You can inflate the ball until it fits perfectly in the cover, the ball will not burst. If this doesn't work, you can let the ball rest for a few hours and then pump in some more air until the sleeve fits perfectly.

If you are unsure if you have the right inner ball, please check a few of the following points.

The size of the exercise ball is indicated where the valve is. Please check that first. 

You can also measure the size of the cover to see if it is correct. A cover for a 65 cm exercise ball is approximately 98 cm long.

If these measurements are correct, you will probably need to inflate the ball further. This is best done with a manual 'double-action' pump. An electric pump is often not strong enough to handle the pressure of the ball.

A 55 cm ball is inflated to a circumference of 173 cm
A 65 cm ball is inflated to a circumference of 205 cm
A 75 cm ball is inflated to a circumference of 235 cm

The ball seems to deflate, is it leaking?

With a sitting ball it is not unusual for it to deflate every now and then, so it is certainly normal that it needs to be inflated once in a while. A different environment (temperature) can also play a role. In a cold room the ball will become smaller.

Up to what weight can the sitting balls be used?

The balls are very sturdy and can be loaded to a weight of 300 kilograms.

Are the covers also sold separately?

Yes, we sell the covers separately. You can see all separate yoga ball covers on this page. Please make sure you read the description well to be sure you sitting ball covers match your own balance ball perfectly. 

Can I wash the sitting ball cover?

Yes, all ByAlex covers can be washed at 30 degrees in the washing machine. See the washing instructions. You can also wipe the ball with a damp cloth using some mild detergent. You can also use a special fabric cleaning spray.