Dimples down here. below are the only two pics I have on me that remotely show the sliders. I went dimple down as like you I liked the look, but also, being by the beach, barefoot is gonna happen. Don't want any sliced feet. I haven't had any traction problems, but we aren't exactly in a wet climate. Kids are only 2 and 4 months, so have't had them on them yet.
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First off, nice looking rig.
I asked Bud that specific question. “I like to be barefoot and so do my kids, are dimples up an issue”. Bud replied that are not sharp.
He was totally correct. Dimples up provided the traction needed and are not an issue being barefoot.