As its name implies, the Capo Women's Siena Midweight Jacket is a midweight cycling jacket made for cooler transition months and milder winter conditions. The jacket's Thermal Roubaix fabric and fleece backed Protegge membrane keep you wonderfully warm and insulated from cool, breezy conditions. Thermal Roubaix is made of hollow core microfibers that trap air maintain loft for maximum heat retention. It's also supple and stretchy, conforming to your body without restricting movement. The fleece backed Protegge membrane is wind and water resistant, shedding light showers and mist from dampening your core. Other functional features include bright accents along the front zip and sleeves for boosted visibility, as well as three rear pockets for holding energy gels and extra layers.