buy king mattress online in trichy growell beds and furnitures trichy A PU Foam Mattress is a type of mattress made primarily of polyurethane foam. Polyurethane foam, often abbreviated as PU foam, is a type of synthetic foam material that is commonly used in mattresses due to its supportive and cushioning properties. PU foam conforms to the shape of your body, providing personalized support and cushioning. It helps alleviate pressure points, which can improve comfort and promote better sleep quality.