The step up features a drivey rocker to match a larger wave face though the curves in the tail allow it to fit nicely in the pocket.
 
A hidden vee beneath the front foot to help it on rail at high speed feeding a double concave to the slightest vee out the tail. The step up  goes on rail with confidence allowing you to put everything into each turn without a thought of siding out.
Comfortable and manoeuvrable at any speed and still performing quite well in smaller waves on the face and in the pocket.
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The step up allows you to attack bigger waves with confidence.