we have D3o armour...last summer with the older version back protector...I mean summer 2011 when we were up in Alaska...it was cold...one day Cheryl took her armour out to wash her Traverse jacket and the D3o back pad was severed in half. Now, we did at times put out jackets into our top box and side cases...but in this case the temps were low and it did snap. My feeling is the D3o feels like a bricks if I leave my jacket in the garage with low temps. I bet if i really wanted to I could crack the armour before it has a chance to warm up to my body.
Now...I just keep my gear in the house from this point until the the mornings start to warm up again. I think that the makers of this armour may have over looked its vulnerable points when cold.