(Jim Mone)
The Vikings and Seahawks will play Sunday in record-low playoff temperatures, prompting the NFL to express concern about natural football deflation.
Per Sal Paolantonio: Officials in MIN worried about footballs going under 12 PSI; will use backup footballs in 2nd half that've been inside
— Aaron Levine (@AaronQ13Fox) January 10, 2016
According to Business Insider, the NFL will only switch footballs once -- at halftime. The NFL will reportedly measure the PSI levels of both sets of footballs. No word on if those numbers will become public.