Versatility is one of our prime considerations when choosing a cycling jacket, and the modularity of Pearl Izumi's cold and inclement-weather clothing means that items like the men's P. R. O. Aero WxB Jacket can fill multiple roles when combined with other elements. The jacket can be used on its own when rain is falling but the temperature hasn't followed suit, or it can be paired with a thermal layer for protection against the wind, rain, and cold. The jacket is made from Pearl's 2. 5-layer Barrier material, which provides wind and water protection without sacrificing stretch or breathability. While not insulating on its own, the jacket is well equipped to serve as an outer shell over a thermal layer. The elemental protection of Barrier fabric is nothing new or terribly notable -- after all, Pearl spreads it liberally across its cold-weather line. What does set this jacket apart is its cut, which is fine-tuned from the ergonomic collar to the shaped sleeve cuffs in order to provide a race-ready, flap-free fit even while you're stretched out on the handlebars. The jacket's construction is rounded off with fully taped seams to prevent any sneaky water trespasses, and the waterproof, full-length front zipper has an internal draft flap to keep the wind's probing fingers at bay. A thorough 360 degrees of reflective detailing help keep you visible from all angles in low-light conditions.