Assertion: bassinet's mattress | /r/MadeOf | polyurethane
Facets:
Source sentences:
text: And we like BabyBjorn's dedication to using safe materials, but the board that supports the mattress is made of MDF (just like most others), and the mattress is made of polyurethane.
text: The mattress, which is made of polyurethane supported by an MDF board, is truly comfortable yet also supportive.