CanDo Non-Slip Super Thick Inflatable Exercise Ball, Yellow, 17.7" CanDo Super Thick Inflatable Exercise balls are the strongest, thickest, heaviest inflatable exercise balls in the CanDo product line Extra heavy duty latex-free material supports a 600 lb weight capacity Make exercise fun and improve balance, coordination, flexibility and strength Features a ribbed non-slip vinyl surface that gives extra grip Great for fitness enthusiasts, athletic trainers, and even pregnant women in birthing classes