Here are the top ten things to consider when buying a new mattress:

Comfort: Choose a mattress that feels comfortable to you. This will depend on your personal preferences for firmness, softness, and support.
Size: Consider the size of your bed and room when choosing a mattress. Make sure the size you choose will fit comfortably in your space.
Materials: Different mattress materials, such as memory foam or latex, offer different benefits and drawbacks. Consider the materials used in the mattress and how they will affect your comfort and health.
Durability: A good mattress should last for several years. Look for mattresses made with high-quality materials and construction to ensure durability.
Price: Mattresses can range widely in price. Consider your budget when shopping for a new mattress and look for options that fit within your price range.
Support: Look for a mattress that provides proper support for your body. This is especially important for people with back or joint pain.
Motion isolation: If you share your bed with a partner, look for a mattress that isolates motion well. This will prevent you from being disturbed by your partner's movements during the night.
Temperature regulation: Some mattresses retain heat more than others. If you tend to sleep hot, look for a mattress that is designed to regulate temperature and keep you cool.
Trial period: Many mattress companies offer trial periods that allow you to test the mattress for a certain period of time before committing to a purchase. Look for a mattress with a trial period so you can ensure it's the right fit for you.
Warranty: A good mattress should come with a warranty that protects against defects and premature wear and tear. Look for a mattress with a warranty of at least 10 years to ensure you're getting a high-quality product.