Bouldering is a type of rock climbing which is done without the use of a harness. The equipment used by the climbers are climbing shoes, chalk to keep their hands dry, and bouldering mats to avoid injuries.
In other competitions, the climbers are given a fixed number of attempts for each problem, the time rests between each attempt. In other formats, they are only given the allotted time to fix the problem. In open-format competitions, the climbers compete at the same time. They are given a certain amount of time to complete as many problems as they can.