... 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 ... easy care and machine washable pocket spring mattress Features1) The inner spring with hight carbon steel wire , ... uses Lura-Flex, which is the bestoffset design spring system available. The Lura-Flex barrel designed ...