Traditional hot tubs are known for their hydrotherapy treatments with the water jets installed in them that generate high-pressure water for sore muscles. Inflatable models also have this feature, but the pressure's intensity is less than that of traditional hot tubs.  Instead of the high-performing water jets used in conventional hot tubs, inflatables use air-powered jets to create the bubbling effect. The pressure and water flow are not as strong because inflatable hot tubs are a lot cheaper; therefore, there will be some compromises regarding the features offered.  Hydrotherapy can still be attained using air-powered jets in inflatable hot tubs because there is still a certain level of pressure emitted, and immersing in the warmth of the water also contributes to the soothing feeling.  The number of jets varies in every model, so if this is important to you, you can check out those models with more than 100 built-in air jets if you want that massage feature.