The Arione WingFlex CX K:ium is built with the essential trait of the standard Arione: WingFlex technology. If you look at the rearward wings of the Arione CX K:ium, you'll see that they flex to allow for free thigh movement. Your thighs won't get pinched by the saddle wings with the downward force of your pedaling stroke. This flex -- known as WingFlex -- gives you a near-custom fit without sacrificing the critical shell rigidity and support you need for optimal power transfer and comfort. CX means one thing, it uses a lighter weight foam as compared to the non-CX version. This results in about 40g of weight savings and a slightly lower profile overall.
Formerly, the Arione WingFlex CX was available only in braided carbon rails. But Fizik now makes it available with K:ium rails. K:ium offers an 8% weight reduction compared to Titanium rails, and thanks to its use of Silicium and Chrome, it has better vibration-absorption qualities and more corrosion resistance. These saddles are ICS-compatible.