biggest mattress store near me in bus stand growell beds and furnitures trichy An HR foam mattress, where HR stands for High Resilience, is a type of mattress made from a specific type of polyurethane foam known for its durability and support. HR foam is engineered to be more durable and resilient than standard polyurethane foam. It has a higher bounce-back rate, meaning it quickly returns to its original shape after compression. This resilience helps maintain the mattress's structure and supportiveness over time, reducing the risk of sagging and indentations.