Human: What are the most important things to consider when buying a new mattress? Assistant: 

1. Comfort is key! Make sure you test out different mattresses in person and find one that feels comfortable and supportive for your body type.
2. Consider the size of the mattress.
3. Look at the price.
4. Read reviews from other people who have bought the same mattress.
5. Make sure it has adequate support for your spine.