I don't know about the climbers, but the Perfekt model doesn't give you blisters. I have way more miles on mine than I can remember, and nothing even close to a blister.

It's the only boot that i've seen recommended by a Podiatrist. I believe the cork insole has something to do with it. It molds to your foot, and is like a custom fit boot.

I notice Cabelas is selling the replacement insoles now. I think i'll try some. After almost a decade mine are getting kind of ripe.