I don't think the flex is standard for all companies, they all have their own min and max flex. My friend lives in colorado and a lot of the park skiers out there are in race boots, I have Head Rs100's and i use them in the park and everywhere else and they are a great boot, I'm not throwin 5's but as far as I can tell these boots are fine in the park and they were Heads top end race boot. If you already have race boots that you can use everywhere and you still want another boot for park go with SPK's if you just plan on using them 99% park.
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