Sidi s latest technical innovation is now also available in a summer-edition. The perforated synthetic leather creates a larger airstream to keep your feet cool on the hottest days of t he summer. Sidi developed the Mag-1 with the \"less is more\" concept. Carbon Fiber Brace system. First things notice is that the Mag-1 has no visual brace system. Sidi Integrated a carbon-fiber brace in the boot itself. This brace allows excellent flex movement front-to-back while being firm side-to-side. The rear-upper features a soft red TPU-plastic to prevent the system pushing in your calf. Tecno-3 Magnetic closure system. The newly fitted closure system called \"Tecno-3 Magnetic\" makes sure the boot will perfectly fit by its precise adjusting. It is quick and easy in use due the magnetic closure helping you close the boot with one hand only. The magnets will stick on the boot in order to keep the closure in place. The boot folds together which makes a zipper superfluous. A-Symmetric ankels and a ziples closure. The ankles of the boot are smooth and flat inside for more adherence with the bike and feature a replaceable shock absorbing system in the back and outside. The boot is made of synthetic leather and is triple-stitched on the high-stress areas. The arch and Achilles areas are covered with Sidi’s exclusive elastic textile and injection molded polyurethane comfort panels The Calf of the Mag-1 can accommodate riders with up to an 35cm calf diameter The inner lining features a honey-membrane made from Teflon and nylon which fold around the calf and ankles. The lower part of the boot has a Cambrelle lining. The Toe slider is made from nylon reinforced with fiberglass and features a air intake and alloy insert. The Calf of the Mag-1 can accommodate riders with up to an 35cm calf diameter when measured 25cm up from the bottom of the heel. Other Features: The Mag-1 is 17% lighter than the Vortice Reflection panel above the ankle Shifter pad Tecno-3 system uses an extremely resistant steel wire This item cannot be shipped to the United States and Canada.