... manufacture for production Pocket Spring mattress, Massage pocket spring, Zoned mattress spring, Inner spring, Pocket coil, Pocket Cushion Spring, Sofa Spring, Seat Spring, furniture spring,, Zigzag spring, etc. in China ... spring mattress Featuresfoam mattress detailed product description foam mattress features:1) Very soft and comfortable mattress with two sided pillow tops2) Two layers of spring ...