queen size bed for sale in trichy growell beds and furnitures trichy is a a PU foam mattress, also known as a polyurethane foam mattress, is a type of mattress made from polyurethane foam. This foam is created through a chemical process that results in a material with open cells that compress when pressure is applied and then spring back to their original shape when the pressure is removed. PU foam mattresses are known for their supportive and comfortable properties.