PayLessHere isn't a brand we're familiar with, but a 10-inch hybrid twin size mattress for under $100 ($99.99 to be precise) is something that grabs our attention.

A California king mattress measures 72 by 84 inches, making it 4 inches narrower and 4 inches longer than a king. Do two twin mattresses equal a King? No. Twin beds are 5 inches shorter than a king.

The twin mattress is designed for a single sleeper. It is a common choice for children, ... A California king mattress is 4 inches longer and 4 inches narrower than 2 twin XL.

Our pick for the best 4-inch twin XL mattress topper is the Serene Hybrid Mattress Topper. It combines gel-infused memory foam with 1.5 fluffy inches of a down alternative material in its included ...

Though the same width as a twin, an XL adds five inches of length for a total of 80 inches long. This size could make sense for a teen who’s gotten too tall for their childhood mattress.

Both twin and twin XL mattresses have a width of 38 inches, which is just enough space for one adult. However, if you like room to stretch out, consider a full mattress instead.