The Women's Transition Ltd Jacket may be light in weight but it’s no lightweight when it comes to cool weather protection.  Both the front and sleeves of the jacket are constructed using windproof GORE-TEX INFINIUM™ X-Mid, used to prevent heat loss from windchill. Meanwhile, a warm fleece fabric at the back works to regulate your temperature, allowing excess moisture and heat escape. The fit of the Castelli Transition Jacket allows for an additional, insulating base layer underneath, providing you with extra warmth if the temperatures drop. For essentials and valuables, the 3 rear pockets provide ample room and easy access, while the full-length, asymmetrical YKK® Vislon® zipper, lets you regulate your ventilation quickly and easily. Whether it's taking on spring intervals or enjoying an autumnal endurance ride, the super-light Women's Transition Jacket provides the ideal balance of warmth and breathability across a wide range of conditions.