My 40Below Purple Haze over boots are designed for Alpine or high altitude boots. On my Denali 2008 expedition they fit perfectly over my double boots.
This time, on Mt. Logan I will use them over my Dynafit Zzero4 AT boots, so I modified over boots a little. My Dynafit ST Vertical bindings have a pins in the front and the heel pieces. Good thing is that my Purple Haze over boots are made of neoprene material, which is very elastic and doesn't rip further when you make a hole.
Just because I am big fan of duck tape, I taped it a little from the inside. I don't think this is necessary but I taped it anyway.
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