XXIO 14 Ladies Fairway Woods Dunlop Sports US XXIO 14+ IRONS LionGolf XXIO 13 Irons 6 PW ( 5pcs ) xxio X irons review Comprehensive customer review. XXIO 14 Irons XXIO 14 Irons are a lightweight, premium set built to help moderate swing speed golfers perform betterfeaturing precise tungsten weighting for higher launch, longer carry, and softer landings. Benefit & Technology: VR Titanium A worlds first, brand new titanium alloy that adds silicon to the compositiondramatically increasing design freedom for face and body. For the Irons, VRTitanium allows the toe side of the face to be made significantly thinner, yielding discretionary mass. UltiFlex This all new design optimizes the face and body thickness and roundness for increased overall head flex at impactexpanding both the peripheral highspeed zone and the even faster central zone for higher ball speeds. Rebound Frame with L Groove An Lgroove at the lower body reduces stiffness under the face to amplify flex and increase ball speeds. For XXIO 14, the L groove is positioned lower than the previous Iron model for greater flexibility.