The Skimo folks can help you find the right fit. Thanks Jason for the help! Now for critique...I should preface this with, "I'm 90% a Dynafit die hard." I chose the Alien because I needed a race boot to fit feet too big for the PDG/DyNA boot. I wear a 30 with just a touch of extra length in a Dynafit boot. If only Dynafit made race boots in a 30... Anyway, once tried, I fell in love with the Alien and am trying to convince myself I should get the carbon cuffed Alien now. I spent about 15-days on them last year, including some long races (Gothic and GT). They are durable, reliable, extremely light. They have a short sole length making them agile on boot climbs and easy into crampons. I prefer the locking lever on the back of Alien to the Dynafit buckle (TLT-5 is my main boot, similar top buckle to PDG boot). The BOA is low profile, doesn't hit rocks like a standard buckle sometimes does scrambling through exposed talus. The BOA requires occasional re-tensioning during the day/race--easy and quick. The Scarpa plastic is a little more scratch resistant than the TLT-5 plastic (different plastic in TLT-6) in the rocks.
The Scarpa Alien size 30 is just a little shorter than a Dynafit 30; I had to dremmel out a little in front of Alien. The heal/ankle is wider on the Alien than all Dynafit and older Garmont boots I've used. For my boney heals and ankles, I'm still trying to put the right custom fit pad in place to reduce heal slip and race blisters. It will be well worth the effort of tinkering with custom fit.
The liner is an excellent no non-sense race liner. I put a cork bed in mine, primarily in an attempt to pull my toes away from the end.
I recommend customizing the power strap to prevent it from riding above the cuff and rubbing your shin...easily done with Velcro.
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