Mountain bike pedals are popular both as flat and as clipless pedals. Depending on the MTB discipline you practice, you will choose a different type of pedal. If you are going to enjoy racing through the forest with your mountain bike, then a click system is definitely recommended. You can put on extra power and with MTB click pedals you do not have to worry about clicking in and out, because this is very easy. For MTB pedals there are also different types of click systems, but the most popular is the Shimano SPD pedal. Other mountain bike disciplines use flat pedals, which are, however, specially designed for mountain biking. For example, they have a larger surface area and better grip.