Nylon sole DURABLE& COMFORTABLE : Cycling Shoes is designed with highly-breathable synthetic mesh upper, a unique mountain lock and road lock; Perforated synthetic leather composite uppers enable superior fit and breathability. LIGHTWEIGHT& CONVENIENT : The upper is designed with a portable rotating buckle, adjustable wire guides securely hold forefeet. Easy to put on and take off, go micro adjustments with the simple twist of a dial. OFFER GOOD SUPPORT : The fit is generous, with good arch support and there’s plenty of support around the heel cup to prevent any slippage while climbing or sprinting. VERSATILE & COMPATIBILITY : Compatible with 2 or 3 bolt cleat/pedal systems including Look Delta, SPD, SPD-R & SPD-SL. Suitable for mountain bikes, road bikes, indoor cycling classes, spin class, mountain bikes and traveling. MUCH SAFER IN USE : Bike shoes are designed to offer hard sole, thus saving your energy and protecting you during usage. Standard size, please choose the appropriate size according to your foot length and size chart.