High riser bed frames (Highland Park)

Pop up high riser bed frames. They take narrow twin mattresses - 33” rather than standard 38”.
Blue set and brown set. The lower bed of the brown set takes a smaller mattress around 31”. I have a mattress that fits on that bed if you want. It’s comfortable, but has a couple of holes.
These are the type of bed frames where the second bed stores underneath, and when you want to use it, you pull it out and pop it up so that it’s the same height as the other bed.