Forget training indoors during cool weather when you're zipped into the Capo Women's Siena SL Midweight Jacket. This thermal cycling jacket is ideal for cool transitional months and milder winter conditions, keeping you wonderfully warm with its Thermal Roubaix fabric and fleece backed Protegge membrane. 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 intermittent showers and mist from dampening your core. Further protecting you from inclement weather, the jacket's P 10 membrane is strategically placed along the jacket's backside for extra wind and water resistance. This membrane is also highly reflective, with refined glass crystals embedded into the membrane for luminescence in low light conditions. Other functional features include bright color pops along the hem and zipper for boosted visibility, as well as a dropped rear hem for extra coverage and protection. Additionally, you'll find three rear pockets for conveniently stashing energy gels and extra layers.