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Popularized by Simmons, the first company to mass produce it, the pocketed coil increases the durability and support of an innerspring mattress. A twin extra-long pocketed coil bed, measuring 39" wide by 80" long, is a great mattress option that comfortably sleeps a single adult but doesn't take up too much bedroom space. Check out our twin extra-long pocket coil mattress selection for a high-quality sleep solution for small apartments, dorm rooms, and guest bedrooms.