KWSLR Long-Sleeve WeatherSlayer ™ Cold, wet weather never had a chance with the new Weather Slayer! Cliff Keen’s WeatherSlayer ™ lining features a revolutionary windproof, waterproof, and breathable coated Microfiber material. This highly-technical fabric is surrounded with an ultra-thin layer of polymer that repels water and resists absorption. Moisture just beads up, shakes off and dries quickly (See inset). The WeatherSlayer ™ is the perfect foul-weather shirt to wear during those brisk fall contests or spring lacrosse.