Construction and TextilesThe superLeggera features 36 parts: 5 textiles, 19 patterns, 12 components. The superLeggera is engineered using the ASSOS cycling-specific science of body-mapping pattern design, which is applying specific textiles to suit specific applications. Hence, the wind-exposed front panel construction is a bit heavier than the rear panel construction, which has the objective of protecting you from the sun's rays but in as light a manner as possible. Type. vX121 FabricA new Type. Read more…vX121 custom-made ASSOS fabric is used on the front panel. It insulates and protects you from oncoming winds but feels light enough so as not to bother you. The rear mid-panel features ASSOS-patented Stabilizator technology, meaning the central panel blocks vertical stretch, preventing the jersey fit from sagging and providing an ideal "click on" fit. The side panels are made out of ultralight 4-way contour stretch fabric.