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Spring mattress
A mattress containing springs in a rigid frame (a large thick pad filled with resilient material and often incorporating coiled springs, used as a bed or part of a bed). The spring unit is the main source of support for your body. Five factors can influence the degree of comfort, support and durability of a mattress: the number of springs or coils, their shape, the gauge of wire used, the number of turns in each spring and the distribution of the springs.
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