The clever combination of memory foam and firm springs means this greenwich mattress is sure to give you a great nights sleep the firm 12 5 gauge orthopaedic springs are ideal for keeping your spine in line supporting your posture and helping to reduce morning aches the 20mm memory foam layer gives you a sense of comfort while still supporting your joints the 6 gauge spring frame around the edge of the mattress offers additional support the four flag stitched handles make it easy to man