Fourth Element Xerotherm Women's LeggingsFourth Element Xerotherm Women's Leggings The Fourth Element Xerotherm Women's Leggings are the pinnacle of baselayer excellence, crafted to provide unparalleled comfort and performance under a drysuit. Utilizing Polartec Powerstretch fabric, originally developed for NASA, the Xerotherm creates a layer of air next to the skin, offering superior insulation and comfort, even in the most challenging conditions. Fourth Element Xerotherm Women's Leggings