human
What is the most important factor when selecting a new mattress?
assistant
The most important factor to consider when selecting a new mattress is comfort. It should provide adequate support and cushioning, as well as help you get a good night's sleep. Additionally, it should be durable enough to last for years to come, with minimal wear-and-tear. Lastly, make sure to research customer reviews before making your decision so that you can ensure you're getting the best product for your needs.