From Black Diamond: Sure, we’ve all been there. You’re lured in by “sending temps” then BAM! You’re hanging on the end of the rope due to a case of numb fingers. Well, at Black Diamond, we set out to once and for all crush the problem of numb fingers, and now we’re proud to introduce the Hot Forge Heated Chalk Bag. Read Climbing's in-depth review of the Hot Forge Chalkbag here.