I know they're 'only' boots, but after trying out about 5 pairs, I finally found the Salomon Launch Boa boots (size 10 when I'm usually a 9.5) are the right fit for my narrow feet. My toes aren't killing me any more! : r/snowboardingnoobs
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Good info on heel lift for better snowboard boot fit I found helpful : r/ShredditGirls
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