By applying the technical advancement of hollow core fibers castelli made these tights not only lighter than your normal tights but also warmer and they keep you drier ankle zips are ykk174 camlock and covered with reflective tape for night visibility now youre ready to put in those long base rides all winter long progetto x2 air seatpad maximum technology for supreme comfort the progetto x2 returns with ventilating perforations to keep you cooler and dryer on endurance road rides the