Wetsuit or Drysuit? Choosing Protection for Summer Diving

As the UK diving season properly gets going and holiday bookings start landing in inboxes, one of the most common questions we hear at Diving Academy is disarmingly simple: wetsuit or drysuit? It sounds like a small decision, but exposure protection affects your comfort, your air consumption, your buoyancy control, and ultimately whether you actually enjoy the dive. There is no single right answer, because it depends on where you are diving, how the cold affects you personally, and what kind of diving you plan to do this summer. Here is how we would talk you through it in the shop.

How Wetsuits Actually Work

A wetsuit is not there to keep you dry, and understanding that is the first step to choosing the right one. Neoprene traps a thin layer of water against your skin, which your body then warms, and the neoprene itself insulates that layer from the surrounding water. Thickness matters enormously here, a 3mm shortie is genuinely useful for warm tropical water in the high twenties, a 5mm or 7mm full suit suits UK summer sea temperatures and cooler tropical destinations, and anything beyond that starts to move into semi-dry territory for divers who feel the cold more than most.

Fit matters just as much as thickness. A wetsuit that is too loose lets water flush in and out constantly, undoing most of the insulation benefit, while one that is too tight restricts breathing and circulation over a long dive day. If you are buying rather than hiring, always try a wetsuit on with the kind of undergarment you would actually wear, and get into a genuine diving position, arms forward and knees bent, before deciding it fits.

How Drysuits Change the Equation

A drysuit, as the name suggests, keeps you completely dry by sealing at the neck and wrists, with air rather than water providing the insulation layer, usually topped up with an undersuit for warmth. This is the standard choice for UK diving through autumn, winter, and spring, when sea temperatures rarely climb high enough for a wetsuit to be comfortable for a full dive. Even in summer, plenty of UK divers stay in a drysuit for local sites, since our coastal waters rarely warm past the mid-teens even in August.

Drysuits do add a genuine skills requirement. Buoyancy control works differently because you are managing air in the suit as well as your BCD, and a poorly controlled drysuit can cause an uncomfortable feet-first ascent if air migrates to your legs. This is exactly why we run a dedicated Drysuit specialty within our training pathway, so divers can build the skill properly in controlled conditions rather than working it out for the first time on a cold, murky UK dive.

Matching Your Suit to Your Summer Plans

If your summer diving is entirely UK-based, a drysuit remains the more comfortable option for most people, even in July and August, particularly at the deeper or more sheltered sites our local trips visit. If you are heading abroad for a warm-water holiday, a wetsuit is almost always the right call, and the specific thickness should match your destination rather than what you already own. Divers who do both, UK sites through the summer and a warm-water trip later in the year, often end up owning both, though a well-chosen semi-dry suit can bridge some of that gap for milder UK conditions.

Consider also how many dives you are doing across a day. A single warm-water reef dive in a light wetsuit is a very different proposition to a full day of repetitive UK diving from a hardboat, where cumulative cold exposure adds up even if any single dive feels manageable. If you are planning several dives a day on holiday, err toward slightly more thermal protection than you think you need, since a cold, uncomfortable diver burns through air faster and enjoys the dive noticeably less.

Common Mistakes We See

The single biggest mistake is buying based on what a suit is rated for on paper rather than how you personally feel the cold, since two divers in the same water temperature can have very different experiences. Another common issue is buying a wetsuit a size too big because it feels more comfortable to put on in a shop changing room, when in fact a snugger fit is what actually keeps you warm underwater. We also regularly see divers travelling abroad in a suit that is far too thick for the destination, which leads to overheating on the surface and needing extra weight to compensate underwater, throwing off trim for the whole dive.

Weighting is closely tied to suit choice and is worth getting right before you travel rather than guessing on the boat. A thicker wetsuit or a drysuit both add buoyancy that needs offsetting with weight, and the correct amount varies suit to suit, which is why a proper weight check at the start of a trip, even for experienced divers, is always worth the five minutes it takes.

Caring for Your Suit Between Dives

Whichever you choose, how you look after the suit between dives affects both its lifespan and how well it performs. Rinse neoprene and drysuit shells in fresh water after every dive, paying particular attention to zips, since salt crystals left to dry in a zip track are one of the most common causes of a stiff or failing seal. Hang wetsuits on a wide hanger rather than a wire one, which stops the shoulders stretching out of shape over a season of use, and always let a suit dry fully, inside and out, before folding it away in a bag.

Drysuit seals need particular care, since a torn latex or silicone seal at the neck or wrist can turn a dry dive into a very wet one at an inconvenient moment. Check seals for small tears before every trip, keep them out of direct sunlight when not in use, and consider a proper seal replacement service annually if you dive regularly rather than waiting for one to fail on a dive day. A few minutes of care after each dive adds years to a suit that otherwise represents a genuine investment.

Hire, Buy, or a Bit of Both

For a single warm-water holiday, hiring a wetsuit locally at your destination is often the simplest option and saves packing a bulky item you might use once a year. For UK diving, we would generally encourage owning your own drysuit if you plan to dive regularly, both for fit and for the confidence that comes from training and diving in kit you know well. If you are unsure which route makes sense for your diving plans this year, our team is always happy to talk through the options against your actual trip calendar rather than sell you the most expensive option in the shop.

Frequently Asked Questions

Can I use a wetsuit for UK diving in summer?

Yes, particularly a 7mm suit with hood, gloves, and boots, though most divers find a drysuit noticeably more comfortable once dive times extend past thirty or forty minutes.

Do I need a specialty course to dive in a drysuit?

It is not always mandatory, but we strongly recommend proper drysuit training before your first dive in one, since the buoyancy skills involved differ enough from wetsuit diving to matter for safety and comfort.

How do I know what thickness wetsuit to buy?

Match it to the coldest water you expect to dive in regularly, then adjust based on how you personally handle cold, since this varies more between individuals than most equipment guides admit.

Not sure whether a wetsuit or drysuit is right for your summer plans? Get in touch with our team for honest, unbiased advice, or call us on +44 (0) 118 9761 729, we're at Bellman Court, Great Knollys Street, Reading.