Caving Equipment Essentials: What to Wear and Carry Underground
Getting the equipment right for caving is not about buying the most expensive gear; it is about understanding why each item exists and making sure every piece in your kit is fit for purpose before you disappear underground. The cave does not care whether your harness is this season's model. It does care whether it has been inspected, whether the buckles function correctly, and whether you know how to use it. This guide covers each category of essential equipment with enough technical context to help you make informed choices.
Helmet
The helmet is non-negotiable. Every organised caving body — the NSS, the British Caving Association (BCA), the French Federation of Speleology (FFS) — requires a CE EN 12492 or UIAA 106-certified helmet for all underground activity. Caving helmets differ from climbing helmets in two important ways: they provide significant protection from blows to the top of the head (the direction of most cave roof impacts), and they are designed to carry a headlamp mounting system.
The Petzl Vertex Vent is the most widely used caving helmet in Europe and widely respected in the UK and US caving communities. It uses a cradle suspension system that absorbs impact energy, a ratchet-and-chin-strap system that keeps the helmet securely positioned when you are crawling or working inverted, and a front clip and side rails compatible with Petzl and most third-party headlamp mounts. The Vertex Vent weighs approximately 390 grams and is available in sizes S/M and M/L. It is also certified for rope access work (EN 397), which matters if you are doing vertical work. Other respected options include the Lyon MOLES and the ABS Vario, both popular in the UK.
Lighting: primary, secondary, and tertiary
The three-light rule is covered in detail in the cave safety guide, but the equipment choices deserve their own treatment. Your primary light needs to survive the worst conditions of the trip — submersion, impacts, mud — and deliver enough output to illuminate a cave passage clearly for navigation.
The Scurion 700 is widely regarded as the professional standard primary lamp for serious caving. It runs from a rechargeable Li-Ion battery pack mounted on the helmet, produces up to 700 lumens on full power with a beam designed for cave distance (a tight spot rather than a broad flood), and is rated IP68 for full waterproofing. Battery life on medium output is typically 6 to 10 hours. The Petzl Duo LED 14 and the newer Petzl Iko Core are more accessible price points and widely used in UK and US grottos for general caving.
For secondary and tertiary lights, simplicity and independence from your primary are the key criteria. A Petzl e+LITE or a Princeton Tec Byte mounted in a chest pocket or clipped to a harness loop provides a completely independent backup that can be reached even if your primary helmet lamp is damaged. Use different battery chemistry in your tertiary (alkaline rather than rechargeable lithium, for instance) so a simultaneous battery failure across all three lights is effectively impossible.
Harness: sit harness and chest harness
For SRT (Single Rope Technique) vertical work, you need both a sit harness and a chest harness. Together they form the full body attachment system for ascending and descending pitches.
The Petzl Avao Bod Croll is the current professional recommendation in European caving. It is a combined sit and chest harness designed specifically to work with the Petzl Croll chest ascender, which clips directly into the harness's sternum attachment. The integrated design eliminates the fiddly compatibility problems that occur when mixing separate harnesses from different manufacturers. The Avao Bod Croll is rated to a working load of 140 kg and certified to EN 361 (fall arrest). In the UK market, Edelrid's Canyoneer and the Lyon Maillot harnesses are widely used alternatives.
For beginners at a club or introductory course level, a simpler sit harness (Petzl Corax or equivalent) combined with a separate chest harness (Petzl Torse) is an accessible starting point. Do not use a climbing harness alone for SRT — the inversion forces on a single sit harness attachment without chest support can be dangerous.
Ascenders and descenders
The Petzl Croll is the standard chest ascender for SRT. It mounts on the sternum attachment of a compatible harness, taking weight through the body's centre of gravity when ascending. Paired with a handled ascender (Petzl Jumars or Petzl Pantin footloop) on the rope above, the croll-and-jumars system allows efficient ascending of long pitches with minimal effort compared to the older prussik-knot methods.
For descending, the Petzl Stop is the most commonly issued descender in UK and European cave schools. It is a semi-automatic device: releasing the handle applies the brake, requiring active operation to descend. This fail-safe design is important for beginners. More experienced cavers often prefer the Petzl Rack (a bobbin-style descender) or the Petzl Simple for vertical work in complex rigging environments.
Oversuit and undersuit
A caving oversuit is a durable outer garment designed to protect the body and the undersuit from the abrasion, mud, and water of a cave passage. Warmbac coveralls, made in the UK from heavy-duty nylon Cordura, are the benchmark product for British and many European cavers. They are virtually indestructible on rough cave surfaces, have reinforced knees and elbows, and are loose enough to allow free movement. For wet caves, a semi-drysuit or wetsuit oversuit is appropriate. In warm, dry caves (some of the volcanic tubes in the Canary Islands or Hawaii, for instance), a lightweight synthetic overall may be sufficient.
The undersuit is the thermal layer worn beneath the oversuit. Most cavers in temperate caves use a Meander or Uniforce fleece undersuit — a thick, close-fitting synthetic pile garment that retains a degree of insulating value even when wet. In very cold or wet caves, a wicking base layer below the fleece adds meaningful protection.
Knee pads
In passages requiring extended crawling — and a high proportion of the world's caves include crawl sections — knee pads are not optional. Hard-cap knee pads (similar to skateboarding or volleyball pads but rated for rock contact) strap over the oversuit. Warmbac and Lyon Equipment both make caving-specific knee pads. Standard gardening knee pads and foam pads compress too quickly under rock contact and provide inadequate protection for more than a few minutes.
Footwear
Cave boots need ankle support, grip on wet rock, and enough sole stiffness to protect feet from sharp projections. Specialist caving boots (Michelin-soled Edelrid or Metolius models, or the Millet Trident range) are designed for this combination. In their absence, walking boots with deep rubber lugs perform reasonably in dry and moist conditions but deteriorate quickly in water. Rubber wellingtons are genuinely useful in stream caves with knee-deep water but provide no ankle support for vertical work.
Dry bag
Any item that must remain dry — spare food, a survival bag, emergency clothing, a personal first aid kit, a map — should travel in a dedicated dry bag rather than a general rucksack. PVC roll-top dry bags in 5- and 10-litre sizes fit inside most caving tackle bags. Pelican cases protect electronics (cameras, phones used for trip logging) in submersion conditions.
The principle of redundancy
Cave equipment fails in cold, wet, dirty environments at higher rates than on the surface. The design principle behind the three-light rule, the dual ascender system, and the layered clothing approach is the same: no single failure should be immediately dangerous. Before any trip, check every buckle, inspect every rope for sheath damage, test every light, and carry a repair kit that includes spare batteries, a length of cord, and a small first aid supply.
Caves where guided trips supply equipment are listed on the cave map, along with contacts for local caving clubs that run introductory trips.