My wife and I were cautious about purchasing a foam mattress. We've lived through the waterbed fad of the 1980s. The Polysleep mattress was our choice because of the firm edges around the mattress that provide support when you're sleeping near the edge or sitting on the edge of the bed. We like a firm mattress and were surprised to find that this mattress was much more firm than what we read from many reviews. It stays cool at night. We are very pleased with our mattress and have recommended it to friends, family, and co-workers.