Will this fly as a mountaineering crossover?
Two questions
1: How much is fit customizable, ie. is there a thermomoldable liner?
2: Are these too heavy or burly for spats of glacier climbing? Will i regret my choice when I've toured up to crater rock on Mt. Hood and have to boot up the pearly gates?

Tech Specs:

Shell Material:

PU plastic 

Number of Buckles:

4 

Buckle Material:

magnesium 

Micro-Adjustable:

yes 

Liner:

Loden 

Thermo-moldable:

yes 

Lean Angle:

15 deg, 21 deg 

Walk Mode:

yes 

Binding Compatibility:

All AT and Alpine bindings 

Weight:

8 lb 9.6 oz 

Manufacturer Warranty:

1 year