Hydrostop our unique new technology gives you a much more secure fit between the top of the sock and your leg meaning the chance of water ingress through the top is massively reduced enabling you to go out and stay out whatever the weatherstretchdrystretchdry technology enables sealskinz to produce a product which has a hydrophilic membrane but unlike anything else on the market we also incorporate a huge amount of stretch making this product waterproof breathable windproof and incredib