TNhsoskier,
I had the very same issue. Just the liners alone seemed too short. I would like to have tried an 11 liner in a 10 shell, but they did not have it there to try. I did put on a neoprene bootie socks on my feet and then into the shells and it felt fine, like you said.
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The sport shop heated the liners and had me wear a stack of toe caps. The pain was excruciating while I waited for them to cool. I was so relieved to get my feet out. I think the only things it compressed were my toes, not the liners. They had ne come back and repeat with even more cap spacers. That still did not help. I do not recommend heat molding first. I suggest skiing in them first and then see what you think.
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I read something that someone wrote that they think your toes have to be at the end to keep your feet in place. Maybe they are right.
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Even though my big toe is uncomfortable, I like these RS-1s better than anything so far. The liners continue to give me a callous on the front corner of my two big toes, and I keep trimming them off and make sure those toenails stay trimmed short.
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You could always try on the next size up. But I have gotten use to the pressure on my big toes. There would be no way I could take a long hike in boots this short, but I only ski for 15 minutes at a time and it is a different kind of movement from walking. Also, the pressure is in no way painful, it is just something I am not used to in shoes. Now the excruciating pain from the cramping that the Animal bindings gave me was unbearable.