Pearl Izumi Women's X Alp Enduro IV Mountain Shoes. The Pearl Izumi Women's X Alp Enduro IV mountain shoe provides the award winning performance and comfort of the X Alp shoe with the security and precision adjustment of a ratcheting buckle retention system. The synthetic leather and mesh upper is comfortable, durable, and breathable while the sole balances stiffness for pedaling efficiency with toe flexibility for hike a bike sections and short walks. The lugged outsole provides excellent traction and pedal adherence. Additionally, the flexible forefoot, EVA midsole, and beveled heel maximize comfort when you're on foot.