For racing, basically (from what I know). I just started seeing this at races this year.
Opinions? Are there many manufacturers? I've always tried to minimize pulling liners out and stuffing them back in too many times, so that would be a concern for me (am I wrong about that?). Some guys now bring hair driers with them to soften the shells so they can get the liners/their feet in (since you have to tie them first, obviously).
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