Twin 39" x 75" (also known as single)
A twin (aka single) accommodates one person and is most commonly used for daybeds, trundles, and children’s beds. A full grown adult may find that a twin mattress is a tight fit.
Twin Extra Long (Twin XL) 39" x 80"
Most commonly seen in college dorm rooms, twin extra long mattresses provide excellent length while at the same time saving space in cramped quarters. The best selection of bedding is available in the summertime before the school year begins.
Full 54" x 75" (also known as Double)
A full (aka double) is the recommended size to comfortably accommodate one adult. Two individuals might find a full size mattress a bit snug, as each person will have much less than a twin size mattress each. This size is perfect for a guest bedroom or in studio apartments.
Queen 60" x 80"
A queen is America’s most commonly used mattress size. Equal in length but not nearly as wide as the King, a queen is a great fit for small master bedrooms. Crammed for space? Have narrow doorways and staircases? Custom queen mattresses are also available with a split boxspring for easy moving.
King 76" x 80" (Also known as Eastern King)
A king (aka Eastern King) is quite a bit wider than a queen, offering each sleeper the equivalent to a twin size mattress. This bed is well-suited for a large master bedroom. This mattress comes standard with two twin size boxsprings as a foundation.
California King 72" x 84" (Also known as Western King)
The California King (aka Western King) is the standard size king on the West Coast. The longest mattress by four inches, the California King is comfortable and spacious for all adults. Comes standard with two boxsprings.
In Addition, Mattress.com offers mattresses in the following sizes:
30 x 75
33 x 75
27 x 52 (Crib Mattress)
54 x 80 (Full XL)
48 x 75 (Three Quarter - 3/4)
30 x 80 (Split Queen)
60 x 75 (Short Queen)
36 x 84 (Split Cal King)
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