A unique aspect of bouldering is the general lack of any requirement for
climbing protection equipment that is associated with most other forms of
rock climbing, such as
sport climbing or
traditional climbing. There is some concern amongst climbers about the excessive use of bouldering mats and in particular the employment of 'stacking' (i.e. layers of mats in a vertical pile), and whether 'stacked' mats are akin
aid climbing that could help with a difficult 'first move' on a route, and whether the use of 'stacked' mats reduces the objective danger—and thus the
technical grade and challenge—of a given
traditional climbing or
highball bouldering route. In 2023, Austrian climber wrote in
Climbing regarding the use of excess bouldering mats, "Today, we see landing zones resembling construction sites", and adding: "... I wonder if it wouldn't be more honest just to
toprope?". ==Origin==