This vest provides windproof protect and packs down to the size of your fist. With our 2L WxB Membrane technology, this vest sheds all but the worst of the rain keeping your core dry where it matters most. The ultra-light fabric has superior stretch to provide a compressive fit like the rest of your professional kit. Two-way front zipper allows you to dump excess heat during a climb or access your rear jersey pockets. Thanks to its low gram weight and minimal bulk, it fits easily in a jersey pocket when the sun emerges, making it simple to stow for the unexpected.