Our smart Hula Hoops provides a seamless body workout by simply rotating the gravity ball attached to the hoop. The smart Hula Hoops is our newest invention for exercising from home. Experience fun and effective ways to exercise while burning 500 calories an hour! Our Smart Hoop fits comfortably on your waist, does not fall out, and most importantly, does not leave bruises like normal weight hula hoops! Let's girls do more exercises in the same time! OUR GUARANTEE We are confident that we offer some of the best products on the market. Therefore, we provide a 30-day guarantee. We will make every effort to ensure that you are completely satisfied with your purchase. Online shopping can seem daunting. We want you to know that there is absolutely zero risk of purchasing something. We won't make it difficult if you don't love it. We offer email and ticket support 24 hours a day, 7 days a week. If you require assistance, please contact us. Please contact customer service if you have any problems with your purchase.