Castelli always thought they could do better with long sleeve jerseys. But they needed to create the new Thermoflex Lite fabric to do it. It's lightly brushed for warmth, polyester-based for moisture management, but has an incredibly tight weave that keeps more wind out while being in fact lighter than normal fleeced long sleeve jerseys. Add in just the right stretch, and you have what we think is the ideal LS jersey.
THERMOFLEX LITE fabric for excellent warmt h and wicking
Silicone gripper on back keeps jacket from riding up