How to Choose Your First Wetsuit: The Complete Beginner's Guide

You've just signed up for your Open Water certification. You're excited. Then someone asks: "What wetsuit are you getting?", and suddenly the excitement turns into confusion. 3mm? 5mm? Full suit? Shorty? Neoprene or skin? Don't worry. By the end of this guide, you'll know exactly what to look for.

Why Your Wetsuit Matters More Than You Think

A wetsuit isn't just about staying warm. It protects you from jellyfish stings, sharp coral, UV rays, and helps with buoyancy control, a key skill every new diver is working on. Getting the right one from the start will make your dives longer, safer, and way more enjoyable.

Step 1 : Pick the Right Thickness

Wetsuit thickness is measured in millimetres (mm) and directly linked to water temperature:

• 1–2mm (Skin / Rashguard): Tropical waters above 28°C (82°F). Mostly for sun and abrasion protection.
• 3mm (Full suit or Shorty): Warm waters between 22–28°C (72–82°F). The most popular choice for destinations like Bali, the Red Sea, or the Caribbean.
• 5mm: Temperate waters between 15–22°C (59–72°F). Think the Mediterranean in autumn, or the Atlantic coast.
• 7mm + Hood + Gloves: Cold waters below 15°C (59°F). Diving in the English Channel, Norway, or at altitude? This is your setup.

Pro tip: If you're unsure, always go one thickness up. Being slightly warm is always better than shivering through your safety stop.

Step 2 : Full Suit, Shorty, or Semidry?

The cut of your wetsuit matters as much as the thickness:

• Shorty (short sleeves + short legs): Great for warm, shallow dives. Easy to put on, minimal protection.
• Full suit: The standard choice for most recreational divers. Covers everything, maximum thermal protection.
• Semidry suit: Designed for colder environments. Better seals at wrists, ankles and neck keep more water out. Not a drysuit, but much warmer than a standard wetsuit.

For your first wetsuit, a 3mm or 5mm full suit is almost always the right call, it covers the widest range of dive conditions.

Step 3 : Fit is Everything

A wetsuit works by trapping a thin layer of water between your body and the neoprene. Your body then heats this water, keeping you warm. If the suit is too loose, cold water constantly flushes through and you lose all thermal benefit. If it's too tight, it restricts your breathing and becomes uncomfortable after 30 minutes.

When trying on a wetsuit:

• No excess neoprene at elbows, knees, or armpits
• Snug around the neck without choking you
• You should be able to take a full, deep breath
• Squat down, it shouldn't pull uncomfortably at the shoulders

Step 4 : Budget, How Much Should You Spend?

You don't need to spend a fortune on your first wetsuit. Here's a realistic breakdown:

• Entry-level (€60–€120): Brands like Cressi, Beuchat, or Decathlon. Solid quality, ideal to start.
• Mid-range (€120–€250): Better neoprene, improved seams, more comfortable fit. Scubapro, Mares, Aqualung.
• Premium (€250+): Yamamoto neoprene, ergonomic cut, built for frequent diving. Worth it once you're diving 50+ times a year.

Start mid-range if you can. A good entry wetsuit that fits well beats an expensive one that doesn't.

Quick Decision Chart

Final Thoughts

Choosing your first wetsuit doesn't have to be overwhelming. Focus on water temperature first, then fit, then budget. Once you've got the right suit on, all that mental energy goes back where it belongs, on the incredible underwater world waiting below the surface.

Ready to gear up? Check out our guide on How to Choose Your First BCD and our article on The Complete Scuba Gear Checklist for Beginners to complete your setup.