Will the mattress smell when unpacked?

There is little to air out. The initial scent reads low and clears in under 12 hours, well inside the several days a tightly boxed bed can take, because this mattress ships flat-packed rather than vacuum-compressed. All its foams are CertiPUR-US certified and independently tested for low VOCs, and it is built in Ontario. Unwrap it, give the room a day of airing, and any faint smell is gone. Off-gassing scores 9.0.