Running and cycling gear have a lot in common, like the need to be breathable, flexible, feature-rich, and streamlined, so it's not surprising that Sugoi's RSE Alpha Men's Bike Jacket is really just an altered version of its award-winning, weather-proven Alpha Hybrid running jacket. It uses the same fabrics and similar design, with a cycling-specific cut and details that make it more at home on the bike. The foundation of the Alpha is Micro Pro, a thermally efficient and breathable fabric that delivers surprising warmth in a thin, mobile package. It also sheds wind and resists moisture, so chilly breezes and light rain won't turn you into an icicle before you've ridden 10 miles. By lining the jacket with Polartec Alpha insulation, Sugoi makes sure it delivers enough warmth to keep you comfortable on chilly days, and it included ultra-breathable MidZero fabric at the sides, arms, and center back to increase ventilation and reduce moisture buildup during high-energy rides. Of course, a cycling shell is only as good as its details, so Sugoi loaded the Alpha up with all the essentials. The high, contoured collar and asymmetrical front zipper seal in heat without irritating your chin and neck, and the zippered back and chest pockets hold your riding essentials securely. A significantly lower back hem provides full coverage when you're in an aggressive riding position, hook-and-loop cuff closures seal out water and drafts, and plenty of reflective details help you make it home safely in the evening.