These neoprene booties are a bit more heavy duty than the 3mm type and they seem to be longer lasting. However they also cost more. It is made for diving, but works just as well for kayaking with a dry suit. The one advantage of these booties is that they work equally well for short day hikes, so it negates the need for a pair of hiking boots. I still wear them with neoprene socks however, as they can pinch a little without them.
The Youtube Video below from Deep Blue Dive does a good job of showing the features of the bootie.
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