The highly compressible Phosphor Mitts are your go-to insulation for frigid alpine environments and rapidly shifting weather. Made with a water-resistant and breathable two-layer GORE® WINDSTOPPER ® fabric, these mitts are filled with warm 600-fill power down. Water-resistant synthetic suede palms with a fleece backer add extra durability and protection to these warm, compressible, weather-fighting gloves. Features. Water Resistant. Windproof. Breathable. Lightweight.