Alpinestars Smx Air Jacket - Black Bright RedAlpinestars Smx Air Jacket The SMX Air Sport Jacket features a main chassis constructed from tech mesh on the riders abdomen, back, and inner arms, paired with 450D polyfabric reinforcement on the outer arms and shoulders. The SMX Air also incorporates perforated 450D polyfabric on the upper chest for excellent levels of airflow during the warm, summer riding months. Extended polyamide stretch material has been incorporated on the riders back,