Resistance when adding FrostGuard source in PureArcticMirCrown

[Ding]

I have a PureArcticMirCrown, and it then of course has +5 Ice Resistance. If i now install a FrostGuard source in this helmet, will it still only be +5% or will it increase to 10%?

 

[zad48231]

Crystal Guard source adds 5% to any existing stats