Crash pads: the UIAA standard and what its rating means.

Where pads fit

The BMC defines bouldering as climbing at low height on small rocks, boulders or indoor walls, on routes called problems, and says padded mats are commonly used. It describes highballing, where bouldering meets soloing on a tall problem, usually with pads and spotters, as high-risk. The bouldering page explains the discipline.

The standard: UIAA 161

The UIAA lists UIAA 161 Crash pads at version 5 (2018). Unlike most climbing gear, crash pads have no matching EN standard in the UIAA's list. The text of UIAA 161 was not available for our research.

The UIAA reported in June 2021, after its Safety Commission plenary of 31 May to 1 June 2021, that crash pads were among the newer UIAA standards whose number of Safety Labels had grown.

Critical fall height and HIC, as far as we could confirm

The clearest public description of the test is a UIAA "Safety Standards Update" on crash pads, which we could see only as an undated search snippet because the page would not open. As summarised there, and therefore unconfirmed:

• The UIAA 161 test drops an instrumented headform onto the pad from increasing heights until it finds the height that produces a Head Injury Criterion (HIC) score of 800. That height is the pad's critical fall height.
• HIC was first developed to relate head impacts to injury in car accidents.
• The UIAA said the chance of serious brain injury at the HIC 800 height is under 2%, and that its threshold is stricter than playground surfacing standards.

A critical fall height is the result of a laboratory drop test with a headform on a new pad. It is not a statement about any real fall onto a pad.

Why makers' figures may not compare

Ocun, a maker, publishes critical fall heights for its pads at HIC 400 rather than the HIC 800 that the UIAA summary describes, as shown in search results of a data sheet we could not date. Fall heights measured at different HIC levels are not comparable with each other.

Indoor matting

Indoor bouldering walls fall under a different standard, EN 12572-2:2017, which the Estonian standards body lists as covering bouldering walls, valid from 3 February 2017 and replacing the 2008 edition. The UK's Association of British Climbing Walls says in its Code of Practice that bouldering areas need suitable impact flooring. The climbing gyms page covers the wall standards.

What injury data records about bouldering falls

Several studies describe falls onto mats as the main source of bouldering injuries:

• A gym study by Schoeffl and colleagues, reported by the BMC on 30 September 2013, recorded 30 injury events in 515,337 registered visits; 6 were in bouldering, and bouldering injuries were mostly falls onto the mat.
• The German Alpine Club (DAV) and KLEVER's 2024 gym statistics, reported by LACRUX, found about 75% of reported accidents happened in bouldering, about 85% of those were falls onto the mat, and leg injuries predominated.
• Madsen and colleagues (2025), citing earlier work, report that emergency bouldering injuries rose about fivefold from 2010 to 2020, often involving foot and ankle injuries from falls. They cite a German hospital series of 430 bouldering patients with mostly lower-limb injuries: 53% sprains, 22.8% fractures and 11.9% dislocations, with 19.9% admitted to hospital.

A suspected injury from a fall needs medical care. The injuries page describes what the medical sources report.