Acera AR 7/8V Derailleur Dampener Includes advanced sleep monitoring with

Includes advanced sleep monitoring with REM sleep and gauge blood oxygen saturation levels during the night with the wrist based Pulse Ox Sensor

running and cycling performance tests

Hydrodynamic - cap helps create a smooth profile in the water and reduce drag

snag-resistant fabric

and ready before the game—or after—this is what you wear

Acera AR 7/8V Derailleur Dampener Includes advanced sleep monitoring withManufacturer: Shimano Model: RD M360 Group: Altus Wide link design increases durability and shifting accuracy Light Action system provides improved performance Less weight Enlarged 13T idler pulley Guide wheel 13T Capacity 43T Compatible with 7 8 row drives