*FSA OS99 Carbon Stem Black 100mm +/- 6 Swim-Wetsuits-Men PRO Hypervent Jacket 2 is

PRO Hypervent Jacket 2 is a highly ventilating pro-grade running jacket designed for dedicated runners who work out with a purpose

WickMeshTM side panels & cuffs: 95% polyester & 5% Spandex

it offers maximum performance without compromising durability or handling

and a redesigned

Micro-perforations all over back

*FSA OS99 Carbon Stem Black 100mm +/- 6 Swim-Wetsuits-Men PRO Hypervent Jacket 2 isThe K Force OS 99 CSI stem is 3 D forged and CNC machined from AL2014. Then its combined with a carbon structure using our CSI (Carbon Structural Integration) technology. CSI is a process that permanently bonds carbon to alloy to create a true hybrid product, with many of the benefits of aluminum and carbon. The final details reduce the OS 99 stems weight by using a 4 bolt sculpted AL2014 alloy carbon faceplate and titanium hardware.