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Mattress sizes are notoriously confusing, but in general, a "double" is significantly wider (as in, over a foot wider) than a twin and will not fit on a twin frame.
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It varies, which is why mattress pads and fitted sheets state that they fit a range of depths.
Twin-size mattress is a wider cousin of Single-size mattress. Ideal for single adults and small spaces, Twin-size mattress can also fit in well in a room measuring at least 10.5 feet by 8.5 feet. Twin-size mattress gives you extra width to stretch yourself while sleeping and allows you to be a little more carefree with the space on your bed.
They will fit if you will have to tuck the extra length in at the bottom.