# How to Choose the Right Mattress Firmness: Memory Foam vs. Spring vs. Hybrid (2026 Buyer's Guide) Choosing a new mattress is one of the most important decisions you'll make for your sleep quality, yet most people don't know what they're looking for when they start shopping. Walk into any mattress store (or scroll through an online marketplace) and you'll hear the same confusing terms: "firm", "medium", "plush", "memory foam", "inner spring", "hybrid". One salesperson swears by memory foam for back pain.