Name: Mattress_01
Format: 3Ds Max 2021
Render: Corona
Export: FBX, OBJ+mtl
Polys: 67 408
Verts: 72 123
Units: Millimeters
Size: 160x200x26 cm
90x200x26 cm

If your version of 3ds Max is lower than 2021, use the FBX file.

For Corona Render: it is recommended to use a version no lower than 1.5, as the glossiness of the materials is set with PBR in mind.

Turbosmooth is applied to the objects during rendering; in the file, the objects are without the modifier. Adjust the smoothing level as needed.