Firey chili and beans for your pre-paddling meal.
Seriously, though...long insulated boots such as Chota Mukluks (with a pair of thin wool socks over your feet inside) will go a long way toward keeping your lower legs warm. You can sit on a yoga or other closed-cell foam pad to keep the upper legs and butt warm.
I am assuming you do not have a drysuit, in which case you can add a layer of fleece pants inside.
GO Easy Utility Trailer
Heel and Pegpads™
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