This is a great, lightweight, warm boot for any high altitude peaks (Denali or other big peaks in the Alaska Range). I got these boots new a couple of months ago and have only worn them once for a two day trip on the Kahiltna glacier. Unfortunately they were slightly too big so I am selling them for half of the retail price... ($990). I am currently based out of Bellingham, but come through Seattle regularly and wouldn't mind bring them to you or ship them if you are seriously interested.
This super lightweight double boot has a PE thermal insulating inner boot that is coupled with a thermo-reflective outer boot with an integrated gaiter.

We used a super insulating lightweight PE outsole to keep the weight down and the TPU midsole is excellent for crampon compatibility and stability on steep terrain.

IDEAL TERRIAN: High altitude 8000 meter peaks