For 2019 K2 have introduced the Lineup into their range, this is the replacement for the popular all mountain freestyle binding the Lien FS. Progressive freestyle riding demands a binding that moves with you, not against you an the Linup certainly achieves that as it is built on a lightweight chassis with K2â€s Tripod technology for a customizable lateral flex. The Tripod chassis is 3 contact points one either side at the front of the binding & one right under your heel. This reduces the contact area down to its most minimal form when combined with K2s mini disc used on this model. What does all this mean? It allows the chassis to have a more lateral flex to feel a more forgiving & free. The Lineup comes with K2â€s flexible Tweakback Opti Highback, this is a full urethane highback is designed to flex so you can tweak grabs & bone out presses all day long. The eraser gaps on these highback not only lock your boot back better but the are also asymmetric (you can see with the slant on the gap) so the flex pattern differs from right to left specifically for each calf, clever stuff! An excellent choice for any all mountain freestyle rider or park rat alike!