With the Boa L4 retention system, top notch ventilation, and a stiff outsole, the Louis Garneau LS 100 Women's Shoes offer an affordable package of top tier features. The LS 100 uppers are constructed with synthetic leather and mesh for comfort, durability, and breathability. To hold your feet in place, these shoes use Boa L4 technology for total control over fit with the turn of a dial. The Boa L4 system weighs up to 23 less than other cycling shoe closures and provides better pressure distribution across the top of your feet. Louis Garneau uses a heel retention system to wrap the back of your heels with a stirrup shaped composite ensuring your shoes stay in place for maximum power transfer to your pedals. An ultra low stack height, combined with the LS 100's carbon reinforced nylon outsoles, gives you a rigid pedaling platform to transfer as much power to your pedals as possible. The shoes use a multi vent system at the toe box and outsole to keep your feet cool, and interchangeable Coolmax Ergo Air insoles let you choose between more airflow on warm days and less on cold rides.