It's foam, but not as you know it Tired of heavy, sweaty foam? Us too. That's why we introduced Aurora® airflow foam in our range of Hyde & Sleep mattresses. Aurora® is designed with an open cell structure, which allows air to flow freely through the foam to stop heat, moisture, and odours from building up. You'll enjoy a cooler night's sleep, while your mattress stays fresh and hygienic for years to come.