Shimano PD-M323 are SPD pedals that combine the performance of an SPD pedal with the convenience of a platform pedal. They feature a single-sided SPD mechanism on one side and a traditional platform on the other. This allows you to choose between the efficiency of SPD cleats for long rides and the comfort of a platform pedal for casual riding. The pedals also have adjustable spring tension, so you can customize the feel of the engagement and release mechanism to your liking.