You dont EVER want to fight a polar bear.  Under no circumstances EVER!  But, if you absolutely HAD to fight a polar bear with a knife, this is the one for it.
 
12" OAL with 6" cutting edge
.265" thick S30V - black Cerakote(TM)
Carbon fiber handles with OD g10 liners
Custom Kydex Sheath with Fastec style belt clip