Therefore, bicycle boots can be used with the contact pedals of mountain bikes. The rigid sole ensures the best power transmission from the foot to the transmission, thereby improving the pedaling efficiency. Due to these holes, optimal ventilation is achieved during hot travel. The high-speed lacing system provides fast and perfect tension adjustment. Bicycle shoes will be a great gift for bicycle enthusiasts. When choosing cycling shoes, please use the size chart shown in the photo. Composition: 70% polyurethane, 30% nylon. The following are the sizes corresponding to the shoe size： 36=CN-37 foot length 230mm， 37=CN-37 foot length 235mm， 38=CN-38 foot length 240mm， 39=CN-39 foot length 245mm， 40=CN-40 foot length 250mm， 41=CN-41 foot length 255mm， 42=CN-42 foot length 260mm， 43=CN-43 foot length 265mm， 44=CN-44 foot length 270mm， 45=CN-45 foot length 275mm， 46=CN-46 foot length 280mm， 47=CN-47 foot length 285mm， For thick or wide feet, please make one more size.