The Trace 2 offers a reliable sole that won't waste your energy on flex, and supple uppers that gently hug your foot in place for support through long miles and punchy climbs.INFORMATIONSOFT INSTEP CLOUSURE SYSTEM Anatomically curved strap combined with a soft, thermo-formed EVA pad that distributes pressure evenly over the instep area.Adjustable from both sides, to perfectly center the EVA pad over a high or low instep.The system eliminates the need for the High Instep Extender.The system is replaceable.TECNO-3 SYSTEMFit along the entire length of the shoe.Adapting the upper to the shape of the foot for a customized fit.The famous reliable and replaceable closures are improved by all new proprietary sidi Wire material.The system is serviceable and replaceableHEEL CUPReinforced cup the stabilizes and supports the heelIncreased power transferProvides additional foot protection in the event of a crashSUOLA MTB SR17Sole made of nylon with polyurethane insert.Shape of the sole designed for mountain bike.Central insert with Sidi logo works as non-slip.Toe area and mount crampons can be replace.MEGA FIT4mm wider across the ball of the footMore volume, a high instep and a wider heel cupMega last are EE/EEE width