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wheelZ I have a medium of the exact same model, would consider trading 1 for 1 after trying it on? It fits me just slightly snug right now but the large might be a bit too big so I can't 100% commit but it at least gives you an opportunity to try the medium.
I've only used mine for 1 track event, not a particularly hot day so didn't really sweat in it
Let me know if you want to meet up.