Choosing a canyoning wetsuit

Ask experienced canyoneers what most improved their early days in the sport and a surprising number will say the same thing: a better wetsuit. Cold is the quiet enemy of a good canyon day — it saps strength, dulls judgement and turns a beautiful descent into an endurance test. Getting the suit right matters more than almost any other gear choice.

Thickness: warmth versus mobility

Most canyon water is cold, even in summer, so 5 mm is a sensible baseline, with thicker suits for alpine snowmelt or dark slots that never see sun. But thickness is a trade-off: more neoprene means more warmth and less mobility, and canyoning demands a lot of movement — high steps, swimming, scrambling. The art is matching the suit to the water you will actually be in.

As a rough guide, a 5 mm suit covers the majority of warm and temperate canyons; 7 mm and full hood-and-glove coverage make sense for genuinely cold water, long swims or descents that linger in deep shade; and a thinner 3 mm suit can be plenty for warm, sun-exposed routes where overheating on the approach is the real risk. Think in terms of time in the water rather than air temperature — a hot day means nothing if you spend an hour swimming through a sunless slot.

Why canyon suits are different

A canyon wetsuit is built tougher than a surf or dive suit because it spends the day dragging across abrasive rock. Expect reinforced knees, seat and elbows, often a two-piece design (a long john plus a jacket) for warmth and flexibility, and frequently a hood. The reinforcement is not a luxury — an unprotected suit can be shredded in a single season of rappels and slides.

The two-piece design is worth understanding, because it is one of the clearest differences from a surf suit. A high-waisted 'long john' (sleeveless dungarees) under a separate jacket gives you a double layer of neoprene over the core, where you most need warmth, while keeping the arms and shoulders free for movement. It also lets you adjust: peel off the jacket on a hot approach, then layer up before the cold swims start.

• 5 mm as a baseline; thicker for cold, alpine or sunless canyons.
• Look for reinforced knees, seat and elbows.
• A two-piece suit adds warmth and flexibility.
• Add neoprene socks, gloves and a hood as the water demands.
• Canyon-specific suits last far longer than surf or dive suits on rock.

Fit is everything

A wetsuit works by trapping a thin layer of water against your skin and letting your body warm it. A loose suit flushes that warm water out with every movement and leaves you cold; a too-tight suit restricts the breathing and movement a long canyon demands. Try suits on, move in them, and prioritise a snug-but-mobile fit over a bargain.

Pay particular attention to the neck, wrists and ankles, where flushing happens, and to the shoulders, where a bad fit will exhaust you over a day of reaching and swimming. Squat, raise your arms overhead, and mimic a high step in the changing room — if the suit fights you there, it will fight you all day in the canyon. A correctly fitting suit feels almost too snug on dry land and just right the moment you are in the water.

Looking after it

Neoprene is happiest rinsed in fresh water after gritty descents, dried out of direct sunlight, and stored on a wide hanger or folded loosely rather than crammed in a ball. Salt, grit and UV are what age a suit; a little care between trips easily doubles its life. And resist the temptation to start with the cheapest suit you can find — the comfort difference on a cold, long day is exactly where canyoneers say the money is best spent.

The extremities matter most

Your core is easy to keep warm; it is the hands, feet and head that quietly ruin canyon days. Neoprene socks worn inside your canyon shoes keep your feet working through hours of cold water, and they pad the long walks too. Gloves are a trade-off — they cost you some dexterity on the rope, so many canyoneers carry them and only put them on for the cold sections — but numb hands are both miserable and dangerous when you need to operate a descender. A hood matters more than its size suggests: a startling amount of heat leaves through an uncovered head, and in a sunless slot a hood is often the difference between comfortable and shivering.

Think of the suit and its accessories as one cold-management system rather than a single garment. On a warm route you might wear just the long john and skip the gloves; on an alpine descent you layer the full two-piece with socks, gloves and hood, and perhaps a thin thermal rashguard underneath. Building that flexibility — a suit you can dress up or down around the day's water — is what lets one wetsuit cover a wide range of canyons, and it is a far better investment than owning a single very thick suit that cooks you on every approach.