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The Original Mattress Factory offers a wide selection of hand-built twin-size mattresses. Twin-size mattresses are 38 inches x 75 inches (± 1 inch). Our twin-size mattresses are available in 15 innerspring and three foam models, including two-sided and one-sided models and in comfort levels from soft to hard. All of our twin-size mattresses are designed to provide support and comfort for an adult. We highly recommend you pair your new mattress with a real working box spring. If your new mattress will be used on a bunk bed, you may want to consider a bunk board to ensure adequate support for your mattress.