【Bonnell Coil Spring, Strong Support】BedStory Double mattress, the springs are tightly interlocked with each other, which is durable and does not collapse. The spring reasonably disperses the body pressure providing balanced support for your body. Dimensions L x W x H：135 x 190 x 14 CM 【Expertly Crafted, Soft Comfort】 The foam mattress is not too soft nor too firm for all sleep positions. Dense foam conforms to your body contours, creating the appropriate highs and lows for ideal comfort and support. 【Breathable Fabric】Breathable knitted fabric and spiral structure spring system improve the breathability of the bedding mattress, bringing a fresh and comfortable sleeping environment and staying away from sweat. 【Fashion Design】Beautifully tailored and detailed with a stretch knit fabric cover with design edge and matching knit side panels. 【Skillfully Packed】This twin mattress is expertly compressed and rolled into a compact box that arrives at your doorstep. simply unbox, unroll and this mattress does the rest, expanding to its original shape within 72 hours.