In Trad Climbing, climbers use their own gear for protection whereas in free (aka sport) climbing pre-drilled bolts are clipped with carabiners. Trad climbers use friends, chocks, stoppers and other passive and active gear instead. These are devices of different shapes you can stick in cracks or holes for protection without damaging the rock. This is called clean climbing and is the only acceptable way of climbing in some areas. Due to the technicity of this kind of climbing it is mostly reserved for advanced climbers.

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