If you add hot water and turn on the power supply, the bubble will emit a jet bath-like bubble that gently releases the sole of the foot along with the uneven protrusions on the roller and the bottom of the foot. You can enjoy the water at a comfortable temperature by warming your feet, which is also called the second heart, increases blood circulation and improves cold and helps to recover fatigue. Folds to a thickness for storage. No need to worry about the place.