Gore-Tex IV gloves are made waterproof with a GORE-TEX insert. Gore-Tex technology keeps water out of our gloves, while allowing moisture from the inside (perspiration) to easily escape. The result is a glove that's highly breathable and totally waterproof. The microporous structure of the GORE-TEX membrane is what makes GORE-TEX Products completely waterproof. Each microscopic pore is about 20, 000 times smaller than a drop of water, which means no external moisture - from rain to snow - will penetrate the membrane. The pores in the Gore-Tex membrane are 700 times bigger than a water vapor molecule, so perspiration can easily evaporate through and you can stay dry from the inside out. Gore-Tex insert. Waterproof, windproof and breathable..