Obermeyer Alpinist Pant - Men's: The Alpinist is built with HydroBlockA(R) Pro 15,000mm waterproof/breathable technology for uncompromising waterproof performance. Warmth is provided by high lofting 40-gram synthetic insulation. The cargo pocket features a YKK AquaGuardA(R) zipper and the lining is chamois fleece. A high performance pant for those that appreciate the technical details. Fit - ACTIVE Fabric & Insulation HydroBlockA(R) Pro 100% Polyester Stretch Permaloft 40gm Product Technologies State of the art performance where you go, whatever the conditions. HydroBlock(TM) Sport Obermeyer independently third party tests all of its technical fabrics for performance verification. Our high performance specialty fabrics use fully coated hydrophobic laminations and a superior DWR polymer coating for stain protection and coating integrity. HydroBlock(TM) Sport resists up to 10,000mm before water penetration while allowing 10,000 grams of water vapor to pass through within a 24-hour time frame. Full-Motion(TM) articulated knees Garments at Obermeyer are patterned for motion. Extra length in pants and pre-curved knees are crafted to mimic the shape of a body in motion. Full-Motion(TM) Critical Seam Sealing Obermeyer has tested and determined construction seams which are critical to the overall weatherproof performance of an outerwear garment. Through pattern mapping we are able to offer the optimum level of protection, minimizing the garment's interior exposure to the elements. Control Zone Ventilation(TM) with Mesh Gussets Strategically placed adjustable openings and closures for core thermal regulation. Different placements allow you to release and control your body temperature. Underarm vent zips, thigh vents, jacket closures with mesh gussets all insure the greatest flexibility while maintaining waterproof/windproof closures to meet the most challenging weather conditions and aerobic exertion.