The Castelli Men's Short Sleeve Free Sanremo Suit slips stealthily under your wetsuit or stands alone with water shedding and wind cheating properties to speed into T1 and beyond. On the bike, its nearly elbow length sleeves add an extra dose of aerodynamics to slice through the air on the run, its flatlock seams and tri specific chamois minimize chafing and restriction for a comfortable stride. Castelli constructs the Sanremo from SpeedFreak ventilated fabric up top and Instadry Speed fabric across the shorts. These form fitting materials are fast through the water and, once you are on the bike, shed water quickly. Once dry, the Velocity mesh back not only has been proven as a watt saver in the wind tunnel, it also helps to move moisture away from the skin to keep you dry and cool. Aiding in cooling and ventilation is the full length zipper, which opens the top of the suit like a standard bike jersey. You can adjust just how much airflow you desire, and it makes pit stops during ultra endurance races much less time consuming affairs. To minimize chafing, Castelli includes its tri specific KISS Tri Seat Pad, a lightly padded insert that dries quickly after the swim. It's thick enough to support you during that 100 plus mile bike leg, but thin enough that you won't even feel it during the marathon. The Free Sanremo suit is finished with back pockets to hold all of your race day nutrition.