Best Boot Heaters?

[SamLegierski]

After the last Minnesotan winter I dont know if my feet can take another beating, so im going to buy some boot heaters but I dont know what kind to get. Does anybody have any experience with them? Thanks!

 

[suup]

?

 

[profa_212]

^do those work at all?

Always been curious for those super cold pow days.