Assertion: box spring's foundation | /r/HasProperty | paired with innerspring mattress
Facets:
value: often
type: TEMPORAL
Source sentences:
text: This foundation is often paired with an innerspring mattress, as it extends the life of the spring unit at the mattress's core.
text: This foundation is often paired with an innerspring mattress, as it extends the life of the spring unit at the mattress's core.