Fits easily and unobtrusively in your back pocket despite its super light weight this wind vest is very functional protecting your upper body from chilling on a cool spring ride or when flying down a long downhill material 100 polyamide features stretch inserts at the back for more comfort and ventilation perforated for improved ventilation and moisture transmission ultra lightweight fabric optimum protectionweight ratio water repellent highly windproof hem and armholes with elastic edging