First you have to understand concave. Concave is a term of the curve of the deck. Not from nose to tail, but from side to side. You will notice the board dips down in the middle (or comes up on the sides, however you want to look at it). This allows your heels/toes to flick the board for kickflips and heelflips. The deeper the groove (or the more the side come up) the more the concave. So, for a board to have mellow concave it is more flat.
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