I currently wear a Polartec Power Dry base layer and a 60g Primaloft One insulated jacket. This keeps me warm all the way down to about -10C when active(walking/hiking/Cycling).
At temperatures below that would layering another primaloft one insulated jacket be recommended or would it be best to replace the existing jacket with one of greater insulation.
In other words does 60g layer + 100g layer = the warmth of one 160g layer?
Or is it recommended to remove the first 60g and replace with ONE 160g jacket?