I have the Crispi Lapponia and I find that actually tying them looser helps prevent blisters for me, if I’m gonna be side hilling or something I’ll tighten them, but just on the trail I keep them loose. I tend to wear out the heel in my regular shoes and came across the article and I think it helps answer why I get blisters more easily.
www.blister-prevention.com

Why Do I Wear Holes In The Back Of My Shoes?
I can wear holes in the back of my shoes very quickly. It's a common problem. Click here to learn 6 ways to fix this.
