The Castelli Thermoflex Leg Warmers have a simple construction with no pre-shaped multi-panels. Streamlined, these Castelli leg warmers provide everything you need to keep the legs warm and dry. Thermoflex fabric insulates while allowing the skin to breath. As the effort increases, the rider will not overheat and sweat evaporates thanks to the qualities that pull away sweat. The fabric is also exceptionally stretchy making these leg warmers feel almost like a second skin.