The Chrono Expert Reflective Wind Vest from Giro is an easily-packable barrier against wind and chill. This lightweight vest quickly packs down into the included pack sack for easy storage in your jersey pocket or saddle bag, just in case some unexpected weather tries to shut down your ride prematurely. Constructed of a 2-way stretch ripstop nylon, the fabric is completely windproof, but also has a DWR treatment to repel light precipitation and tire spray from wet roads, along with UPF 50+ protection that shields you from the sun's harsh rays on those chilly yet sunny days. For intense aerobic efforts, Giro includes a perforated back panel to regulate temperature and moisture so you don't get overheated or clammy underneath the garment. The whole vest is reflective, enhancing your visibility to other road users during low-light conditions with a stunning pattern that brightens up when exposed to headlights.