There are several types of foam used in mattresses today, and the best type comes down to personal needs and preferences. Memory foam is supportive and pressure relieving, but it has a tendency to trap heat and has a close contour that doesn’t appeal to everyone., Some research suggests that memory foam mattresses are associated with better sleep outcomes., Polyurethane foam is inexpensive and supportive, but the material can be prone to developing impressions over time and lacks durability. Off-gassing can also be a concern, especially when the mattress is new., Latex foam is made from rubber tree sap, and there are also synthetic versions available. It offers similar pressure-relieving properties as memory foam without the heat retention. It’s also incredibly durable and natural latex is an eco-friendly choice, but it can be expensive.