There was no set bonus for the 'Polar Explorer' gear. As per the OP, we started off with bonuses on Toy Man and Operation: Blizzerax stuff.
With that said, I'm adding some new 'back pack' items in the next update that can be looted.
Loot the Polar Explorer backpack, wear it, and you'll get a nice frosty aura and 3X speed (in PvE).
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