Stretchdryour stretchdry technology enables us 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 incredibly comfortable sealskinz thermal ratingseach of sealskinz products carries a thermal guide enabling you to make an informed decision on the best product for your activity how you feel in the cold is always subjective and dependent on activity