Key Features: Lightweight material – Works to actively wick sweat away from skin Temperature regulation – Regulates your body temperature in hot and humid conditions Versatile performance – Perfectly matched to a wide range of conditions Comfortable – A soft and comfortable layer under your bibs and jersey prevents chafing when you sweat How To Wear: Wear with lightweight jerseys (under bib straps) in hot weather. Fit: Designed to sit close to the skin and fit under all jerseys in Rapha’s range.