Wetsuits are good, but when they're wet, and you're moving along at a good clip, the evaporative cooling can be uncomfortable. I found that a good "spraysuit" over top of a wetsuit can be a good solution (in the spring), or just a spraysuit by itself, if the water is warm but the air is not (fall). I have a one-piece version, but they're now also available in two-piece versions2. In Murray's Marine catalog, theyare called "wind top" or breathable semi-dry top and breathable chest-high pants, on p8.