Specialty mattresses need careful measuring, because sizes often do not match standard beds.
- RV and camper mattresses. RV queens are often shorter than a standard queen, and RV kings are often narrower than a standard king. Measure your platform, check for rounded corners, and consider weight and how the mattress will fit through the door.
- Futon mattresses must bend with the frame. Thinner, more flexible mattresses fold easily; thicker ones are more comfortable for nightly sleeping.
- Japanese futons (shikibuton) are thin floor mattresses meant to be rolled up and aired regularly.
- Sofa bed and trundle mattresses have strict thickness limits so the mechanism or drawer still closes.
- Folding and trifold mattresses suit guests, kids' sleepovers and car camping.
Hospital bed mattresses should match the bed's dimensions and any medical recommendations. For standard dimensions, see mattress sizes.