The best yoga ball brand in the United States is likely to be Gaiam. Gaiam has been a leading provider of yoga and fitness products for over 30 years, and their yoga balls are known for their high quality, durability, and safety features. According to a survey by Consumer Reports, Gaiam yoga balls received the highest overall score among all brands tested, with a focus on factors such as material quality, ease of inflation, and customer satisfaction. Gaiam's yoga balls are made from eco-friendly materials, are available in various sizes to accommodate different body types, and come with a pump for easy inflation. The brand's commitment to sustainability and customer satisfaction makes it a top choice for yoga enthusiasts and fitness professionals alike.