The Chrono Expert Reflective Wind Vest from Giro is a go-to barrier against wind and chill. This lightweight vest quickly packs down into the included pack sack for stowing in a jersey pocket or saddle bag, making it easy to take it out on your rides just in case a surprise storm cell tries to end your ride early. 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 more aerobically intense riding, Giro includes a perforated back panel to regulate temperature and moisture so you don't get clammy underneath the vest. Lastly, the entire vest is reflective, enhancing your visibility to other road users during the low-light twilight hours with a stunning pattern that brightens up when exposed to headlights.