Size: 55 cm Ball Cover for Exercise Ball - Sit Better. Do you want to sit even more comfortably on your exercise ball? Then cover it with this modern seat ball cover. The visually appealing cover for seat balls is made of 100% cotton and can be hand washed at up to 30°. Please let it air dry after washing and avoid using a tumble dryer. The integrated stabilization ring on the bottom reliably prevents the ball from rolling away. With the practical carrying loops, you can take your exercise ball anywhere. Additional product details: Material: 100% cotton, Color: Gray, Delivery includes: 1 cover, without ball, available in 2 versions - ø 55 cm, 520 g: for seat balls with a diameter of 53 - 60 cm, ø 65 cm, 710 g: for seat balls with a diameter of 65 - 70 cm.