The Electron Windshirt offers the maximum protection from chill winds that's available in such a tiny package. Made entirely from Shadowbox and weighing in at under 4.5 ounces, it stuffs down to almost nothing into its own chest pocket. A light hem drawcord with tiny cordlock seals out wind as necessary but has such low bulk that it doesn't interfere with tucking in. A similar drawcord at the neck seals out cold or opens for venting; as does the deep front zipper. Plus, with OR's Articulated Shoulder you'll never feel the shoulder binding or lower back exposure when reaching for the next hold or over the handle bars. Extensive testing in the Cascades has revealed the Electron to be an exceptionally versatile performer. Perfect in your hydration pack for breaks in the action, or works great as an underlayer with its slick face.