One size definitely doesn't fit all
When it comes to mattresses, one size definitely doesn’t fit all. There
are several factors you should keep in mind prior to purchasing your
perfect mattress for your bed.
Consider the following:
The mattress should be longer than the tallest person sleeping on it.
The bed width should allow enough space to fold your arms behind
your head without going beyond the mattress edge or touching
your partner’s elbows (for two adults, we recommend either
a queen or a king).