We bought a twin size for my daughter's bed. She LOVES it and commented on how she slept like a baby (she is 17) and did not wake up once all night. It is large enough to fit the entire bed from corner to corner (maybe even slightly larger than the bed!) and it had absolutely NO smell which is very important to her. She has asthma and the smell from a new memory foam topper trigged her cough. My only complaint is that it does not come with a cover but we can find one.