Excuse me, my grandparents were brainwashed in Yongshoutang and bought a mattress. 1W6. Is it worth it? Is it harmful to the health of the elderly? Urgent!

I also bought a mattress for Yongshoutang, which greatly improved my physical condition. People who have no pain will never understand the feelings of the elderly. I can only say that everything I haven't experienced is a lie, just like you don't believe that people hundreds of thousands of miles away can hear each other on the phone without using their mobile phones. If you are still thinking about horses, you are the fastest runner. If I say that cars, trains and planes run faster, you will call me a liar and a madman because you haven't touched them.