1/Seventeen HSF Aeria Stem Faceplate Trueing Stands Temple arm scoops to manage

Temple arm scoops to manage moisture

light weight frame that fits snug to eliminate bouncing and slipping (even when sweaty)

9100 isn't a typo there

and fast drying

*Includes clear visor

1/Seventeen HSF Aeria Stem Faceplate Trueing Stands Temple arm scoops to manageThe HSF Stem Cap allows the Profile Design HSF Aeria bottle to be fitted to our standard 1 Seventeen stem. Performance The HSF Aeria bottle smooth's airflow onto the frame, offering the chance to lower aero drag while increasing hydration carrying capacity. To this point it has required a specific stem the new HSF Stem cap increases the options for access to the HSF Aeria technology Compatibility The HSF Stem cap is only compatible with the 1