bed mattress store near by thillainagar growell beds and furnitures trichy A pocket spring mattress, also known as a pocketed coil mattress or an individually wrapped coil mattress, is a type of mattress that features individual springs or coils wrapped in fabric pockets.Unlike traditional innerspring mattresses where coils are interconnected, each coil in a pocket spring mattress is encased in its own fabric pocket. This design allows the springs to move independently of each other, providing better contouring to the body's shape and reducing motion transfer across the bed.