Most jobs of urban white-collar workers are done in front of computers.As a result of a long time to work, there are some small problems on the joints, shoulder and back，due to muscle rigidity.
Today, most physiotherapy products used to relax muscles use vibrations to move them and increase
their energy.Although this method can deal with mostcases, but for some cases with severe muscle
rigidity, it takes a very long time to have an effect, which is not conducive to relieving the pain of patients.
Moist heat pad（PVC heating pad) can alleviate muscle pain in a short time, because the heat will infiltrate into the depths of the muscle, quickly relieve the severe pain and other symptoms.