Beware: You should never explore wild caves alone or without proper gear. Consider getting in touch with a Grotto of the National Speleological Society at www.caves.org or a qualified cave club. These groups are skilled and will train you. Without sufficient knowledge, preparation, and equipment, cave exploring can lead to serious injury or death.
Caving clothing is a two-layer system, and most people arrive for their first trip having bought only one of the layers. An undersuit keeps you warm. An oversuit takes the damage. Each one does a job the other cannot.
Get that structure right and the rest is detail. Get it wrong and you will be cold in something that tore in the first crawl.
A work coverall is not a caving suit
Plenty of guides point you at industrial coveralls from workwear brands. Those are built for a mechanic standing in a workshop. A cave asks for something else entirely.
You will drag your knees and elbows across wet limestone for hours. Work coveralls put a seam right across the seat, which is the first place a caving suit fails. They have loose pockets and belt loops that catch in a squeeze. The cotton soaks up water and holds it.
None of that means a boiler suit is useless. It means you should know what you are buying and why, which comes later in this article.
The two layers
The undersuit
This is your insulation. Caves in most of the US sit between the low 50s and low 60s Fahrenheit year-round. You lose heat far faster when you are wet and sitting still than when you are moving. A rigging wait of twenty minutes will chill you in a way that walking passage never does.
Dedicated caving undersuits are one-piece fiber pile or fleece. The one-piece cut matters more than it sounds. Separates ride up and expose your back exactly when you are flat on it.
Whatever you wear, it cannot be cotton. Wet cotton stops insulating and starts pulling heat out of you. That rule applies to the base layer against your skin as much as to the fleece over it.
The oversuit
This is your armor. It takes the abrasion, keeps mud out of the layer that is keeping you warm, and in wet caves it sheds water. A caving oversuit has almost no external features by design. No belt loops, no outside pockets, nothing to snag.
It goes over the top of your boots so they do not fill with water, and cavers often seal the gap with a rubber band cut from an inner tube.
PVC or Cordura
This is the choice that divides cavers, and there is no answer that fits every cave.
PVC suits are waterproof with welded seams. They hold heat in a cold, drafty system. They are also easy to patch when something opens up. The cost is sweat. In a warm or dry cave a PVC suit will soak you from the inside.
Cordura suits breathe better and shrug off sharp rock. They are the usual choice for digging and for caves that chew through fabric. They are sewn rather than welded, so the seams are the weak point, and the seat goes first.
The durability gap is real. In a discussion on UKClimbing’s gear forum, a caver averaging three days a month underground reported Cordura suits developing holes within nine to twelve months. His PVC suit had gone five years with none. Others in the same thread argued the opposite. Cordura survives digging trips that would shred a thinner suit, and a tear in nylon spreads fast.
Both are right, which is why experienced cavers own more than one and pick by trip. Cold and wet points to PVC. Sharp and dry points to Cordura.
Lighter nylon suits sit between the two. They dry quickly, which makes them the choice for underground camps and warm caves abroad, and they tear more easily than either.
What to wear on your first few trips
Start by asking the grotto. Most clubs keep loaner gear so newcomers can find out what suits them before spending anything. Borrowing a suit for a few trips teaches you more than any article can.
If you want your own kit for those early trips, this is a reasonable starting set. None of it is specialist, and none of it is wasted once you upgrade.
A synthetic base layer next to your skin. Midweight is enough under a fleece, in a top and matching bottom.
A fleece layer over that. Amazon does not sell a caving undersuit, so a fleece top and bottoms you already own will do the job while you work out whether you want the real thing.
A cotton twill boiler suit as a stand-in oversuit. Order it at least one size up so it fits over the fleece. It will not last and it is not waterproof. For a handful of dry horizontal trips, it is what plenty of cavers started in.
Hard-shell knee pads with proper straps. Soft gel gardening pads slide out of position in a crawl, which is the one place you need them.
Plain rubber wellington boots well above the ankle. Skip steel toes. They add weight for a hazard you will not meet underground.
When you commit
A real oversuit is the point where caving clothing stops being improvised. These come from a small group of specialist makers, mostly European: Warmbac in the UK, MTDE in Spain, and Meander, AV and Rodcle across the continent.
You will not find them on Amazon, and this site earns nothing on any of them. In the US they come through caving suppliers. Inner Mountain Outfitters carries MTDE oversuits and the MTDE Invernal undersuit. Karst Sports in West Virginia has supplied American cavers for decades. UK retailers like Inglesport and Starless River ship internationally, though several suits are made to order rather than held in stock.
Expect to wait, and expect to pay more than you would for workwear. What you get is a garment cut for the positions a caver actually spends time in. Reinforcement sits where the rock reaches you, and nothing on the outside catches.
The rest of the system
Clothing is one part of a kit that has to work together. Your oversuit sits over your boots. Your helmet carries your light. Your gloves tuck into your sleeves so they do not fill with water.
We cover boots and gloves separately, and the full equipment checklist puts the whole list in one place. Lighting is the one thing worth reading about before anything else, and how to build a three-light system covers it.
Before you buy anything
Clothing will not keep you safe underground. Training and the right people will. If you have not caved before, find a grotto through the National Speleological Society or a qualified cave club, and go with them first.
You will come out muddy, you will know what you were cold in, and you will have a much better idea of what to spend money on.