Castelli aero race 6.0 jerseywhat started as seeking small split second advantages in racing has, in this sixth generation castelli aero race 6.0 jersey, become an obsession with creating the most aerodynamic cycling jersey available the advantages are now measured in whole seconds.free speed the name of castelli's very first aero focused cycling jersey was the split second. It caused quite a stir when it first appeared as until then performance cycle jerseys were about efficient moisture management with little consideration of progress through the air. The aero race 6.0 jersey has the dna of that aero jersey but with modern cfd computational flow dynamics to analyse wake flow, it's so much more efficient at reducing drag, honed for speeds between 30 and 55 km h. Less drag equals more speed for the same power output. Faster without more training. Now that's an advantage worth having. Cool comfortit's not just aerodynamically efficient though. Moisture build up is also dealt with rapidly and with ruthless efficiency. All fabrics are quick wicking and a 3d mesh back, similar to their high performance base layers, ensures you're kept cool and dry as you build up speed. All the effort to go fast will mean you need you to keep fuelled. Fear not, the aero race 6.0 has space for all your nutrition via the easy to reach back pockets. The drop tail design keeps them perfectly in position and minimises sagging when they're loaded up too. The aero race 6.0 jersey is castelli's most aerodynamically advanced design to date and yet it's also their best fitting too just ask their worldtour professional riders. A remarkably comfortable high performance cycling jersey whether it's your longest days in the saddle or a short and intense criterium race.featuresmaterials 82% polyester, 18%elastanecfd based fabric placement and seam constructionengineered for aero efficiency at 30 to 55 km hairflow shoulder constructionvelocity rev2 fabric on front and sleeve3d mesh back for breathabilityelbow length stretch sleeves with raw cut edgeykkreg vislonreg zipperdrop tail allows perfect pocket placement while keeping jersey fitting well at the waistsuggested temperature range 18 to 32 degrees cbuy castelli clothing from chain reaction cycles, the world's largest online bike store.