Engineered with high quality, durable materials and rigorously field tested, the Boa Fit System has a sleek, micro-adjustable dial in place of laces, so you can create a precise, custom fit in seconds. Breathable textile helps your foot stay cool. The material hugs and supports you through every step for extra support and comfort. A plush, padded collar helps reduce heel slip while you move. Two Zoom Air units in the forefoot respond to every step. Because they're not fully enclosed, they can move with your foot, allowing for better energy return when you push off through your swing. Two spikes on the forefoot and 2 on the heel deliver exceptional grip in a variety of conditions. A secondary, integrated traction pattern throughout the sole increases gripping power, so you can play with confidence.