Sleeping on the mattress for free and sweating is a scam. In order to enable consumers to buy a satisfactory mattress when purchasing a mattress, some manufacturers have come up with a solution called 100 day free trial sleep. It means that within 100 days, as long as you are not satisfied with your sleep, you can return it for free, including postage. This seems to be a good decision, which reduces a lot of decision-making costs for consumers. You can even sleep on a mattress for a hundred days or more for free without spending a penny. However, I believe that no one buys a mattress for sleeping and playing except evaluation. /kloc-it can be returned within 0/00 days, which is very good. Then, you need to make a new decision, look through countless strategies, compare N products, and rely on other people's evaluation to imagine whether its sleep is suitable for you, spending countless time, energy and even money. Reduce the decision-making cost, which is obviously double the decision-making cost.