Perfect for races or medium distance trail runs with major elevation gains where precision matters. With the quick lacing BOA Fit System, aggressive traction, and a precise fit, this shoe crushes technical terrain Dynamic Cage Construction creates synergy within the lacing structure of the shoe for uncompromising fit and stability on uphill and downhill running. Spyral Tongue EVO provides homogeneous pressure for a perfect fit Shockproof TPU toe cap provides protection from unforeseen elements FriXion XF 2.0 outsole (White "X") with "Mudguard" outsole is super sticky with impressive grip on all types of terrain Dual-density Memlex EVA midsole is lightweight and has co-molded medial/lateral stabilizing inserts When you need precision, stability and synergy between your foot and the trail look no further than the Cyklon. Through extensive R&D between La Sportiva and BOA, the Cyklon was designed for skyraces and offroad technical terrain for short to medium distances.