Xen isn’t made anymore. Hex is cheaper than Xar, but has more vents.
Apart from that, apparently one of them is suited to Super D, the other isn’t. (Don’t ask me!)
Suggested Use: All-Mountain, MTB Trail Ride, MTB Endurance/Marathon
Features: P.O.V.™ adjustable visor w/ 15° vertical adjustment
Construction: In-mold – EPS liner, polycarbonate shell
Fit System: Roc Loc® 5
Ventilation: 21 vents
Suggested Use: All Mountain, trail riding, Endurace/Marathon XC, Super D
Features: P.O.V.™ adjustable visor w/ 15° vertical adjustment
Construction: In-mold – EPS liner, polycarbonate shell
Fit System: Roc Loc® 5
Ventilation: 17 Wind Tunnel™ vents, internal channelling