661 exo shell ii meet the exo shell ii ideal for the xc or enduro rider the exo is made up of a compression baselayer coupled with honeycomb eva protection panels set in place with a sturdy over lock stitch featuresintegral component of the highly adaptable exo seriesinjected moulded back and chest piecesd30 back insert works in conjunction with injected partsremovable back shanks to accept neck braceschassis of breathable perforated eva foam laminated within meshside and shoulder straps ar