Looking for the best mattress in a box? We tested 26 top-rated online mattresses to find the ones actually worth unboxing so you don’t waste money on a bed that disappoints after the first night. From plush pillow-top hybrids to ultra-firm support mattresses and cooling picks for hot sleepers, we evaluated each bed for pressure relief, motion isolation, edge support, cooling and overall comfort. Whether you’re a side sleeper, stomach sleeper, hot sleeper or sharing a bed with a restless partner,