Bikemonger says.... Designed for loose snow they say, but they're just as good in sloppy UK mud. Or sand, if beach (or desert) riding's your thing. 

45NRTH says.... Vanhelga is a fat bike tire designed for trail riding in loose snow. It brings traction to a new level with dual-compound rubber, triple-siped shoulder knobs, and an open tread pattern that sheds snow. Vanhelga sheds snow and tracks flawlessly when the trail becomes soft and sloppy.

120 TPI tubeless-ready casing
Ramped center lugs for rolling efficiency
Aggressive siping for grip
Shovel-design side lugs for predictable braking and cornering