Argington - Ayres Trundle Bed. The Ayres Trundle Bed goes with the Ayres Twin Bed. Mattress supports are ventilated for foam mattresses and accepts all standard twin size mattresses (75"X 39").The trees from which the wood is cut are gorwn in different soils, with different light, under different conditions. Please note for the clear birch finish, the birch wood may vary in color and texture from one part to the next, due to the natural differences found in the wood. Src: 2modern.com