The-Vapor-jacket-is-distinguished-from-other-all-weather-sport-touring-jackets-on-the-market-by-its-unique-ventilation-feature-that-is-100-percent-waterproof-when-zipped-up-yet-allows-direct-airflow-to-the-body-when-activated-The-secret-lies-in-a-special-construction-of-the-vent-in-the-z-liner-waterproof-membrane-which-opens-up-all-the-way-through-to-the-jacket-rsquo-s-outer-shell-This-new-feature-transforms-a-regular-z-liner-constructed-jacket-into-a-true-four-season-piece-Another-innovation-from-REV-39-IT-39-s-in-house-R-amp-D-department-is-the-new-height-adjustable-straps-at-the-waist-&-under-arms-which-help-ensure-a-perfect-fit-for-almost-every-body-type-The-Vapor-is-great-for-all-year-touring-as-well-as-four-season-commuting