KqwertI don't have experience with these, but looking at the specs, they don't really qualify as waterproof or breathable. Usually the figures for those fabrics start at 10k/10k, and the better waterproof fabric is at least 20k/20k or even 20k/35k = much much more breathable. I'm no sailer, but I would think you'd want truly waterproof outer layers for being on the water so I'm a bit stumped by these.