It usually has a slatted base and is open underneath, affording good ventilation for its appropriate mattress. Solid slats provide a firm foundation, while sprung slats are more flexible.
To apakšējo daļu veido elastīgs pinums vai koka līstes, starp kurām ir nelielas atstarpes, kas nodrošina rāmī ievietotā matrača ventilāciju.