The key to more comfort, less injuries, and higher power output comes from our ergonomically designed, scientifically tested Body Geometry features—Longitudinal Arch, Varus Wedge, and personalized insoles with a Metatarsal Button. When used in harmony, these three features align the hip, foot, and knee, while also limiting medial/lateral knee movement and maintaining good circulation down to your toes.Patent-pending closure design secures the foot for extreme, out-of-saddle efforts, locking the metatarsals and preventing la teral roll.Dyneema® is sandwiched between la yers of synthetic and TPU to create no-stretch zones for the ultimate connection and comfort.Our stiffest and lightest FACT Powerline™ carbon plate maximizes power transfer: Stiffness Index 15.Independent BOA® Li2 Fit System for on-the-fly micro-adjustment, backed by the Boa® Guarantee.PadLock™ heel construction cradles the heel and is proven to improve acceleration.Non-slip, replaceable heel tread with internally recessed screws for security.Form Fit la st with a roomy toe box for the ultimate in connectivity and comfort.Titanium alloy cleat nuts can rotate to position cleats 5mm rearward and fits all major 3-hole road pedals.Approximate weight: 220g (1/2 pair, Size 42)