top king mattresses in trichy growell beds and furnitures trichy HR foam and PU foam are both types of foam materials commonly used in mattresses, each with its own characteristics and benefits. HR foam is known for its high resilience and durability. It's designed to offer better support and bounce-back properties compared to traditional polyurethane (PU) foam.It provides excellent support for your body, helping to maintain proper spinal alignment and reduce pressure points.