How to Choose a Drysuit: The Complete Buying Guide
Everything you need to know before buying a drysuit. Covers materials, fit, features, water temperature, and budget to help you make the right choice.
By Sealachi Technical Team — Drysuit Specialists
Why the Right Drysuit Matters
A drysuit is one of the biggest investments a diver makes. Get it right and you have a piece of kit that keeps you warm, comfortable, and safe for years. Get it wrong and you are fighting buoyancy, dealing with leaks, or replacing the suit far sooner than you should.
This guide walks through every factor worth considering, so you can narrow down the options before spending your money.
Start With Your Diving
The single most important question is not “which suit is best?” but “what kind of diving will I actually do?”
Different diving demands different things from a drysuit:
| Diving Type | Key Requirements |
|---|---|
| Recreational cold water | Comfort, ease of use, reliable warmth |
| Technical / decompression | Durability, good trim, reliable valves |
| Wreck penetration | Cut and abrasion resistance, reinforced panels |
| Cave diving | Low bulk, mobility, abrasion resistance |
| Commercial / working diver | Full mobility, heavy-duty construction, repairability |
| Travel diving | Light weight, packability, quick drying |
If you dive wrecks in cold water every weekend, you need a fundamentally different suit than someone doing warm-water technical diving on holiday. Be honest about where you actually dive, not where you dream of diving.
Water Temperature and Environment
Drysuits are not exclusively cold-water gear. Many technical divers use them in warmer water for the gas management advantages and protection they offer. That said, water temperature does influence your choices:
- Cold water (below 10C): You need a suit that accommodates thick undergarments. Custom fit becomes more important here because a poorly fitting suit with heavy insulation creates excess air volume and buoyancy problems.
- Temperate water (10-18C): The sweet spot for most drysuit diving. Mid-weight undergarments, moderate insulation requirements.
- Warm water (above 18C): Thin undergarments or even just a base layer. Packability and weight often matter more than heavy insulation capacity.
Your environment also matters. Salt water, UV exposure, and warm climates accelerate wear on certain materials. Kevlar and some cut-resistant fabrics degrade faster in salt and heat, while standard trilaminate and Cordura hold up well in virtually any environment.
Material: Trilaminate vs Neoprene
The two main drysuit families are trilaminate (membrane) and neoprene (crushed or standard). Here is what actually matters:
| Factor | Trilaminate | Neoprene |
|---|---|---|
| Weight | Light, packable | Heavy, bulky |
| Inherent warmth | None (relies on undergarments) | Some insulation built in |
| Drying time | Fast | Slow |
| Flexibility | Depends on weight and cut | Generally good |
| Durability | Very good with reinforcements | Good, but seams are vulnerable |
| Repairability | Straightforward | More complex |
| Custom fit importance | High (no stretch to forgive bad fit) | Lower (neoprene stretches) |
Trilaminate dominates the custom drysuit market for good reason. It is lighter, dries faster, packs smaller, and lets you adjust warmth by swapping undergarments. Most serious divers end up in trilaminate.
Neoprene suits still have their place, especially for divers who want built-in warmth and a snug, wetsuit-like feel. But for versatility, trilaminate wins.
Fit: Custom vs Off-the-Rack
Off-the-rack suits come in standard sizes. If your body happens to match those sizes, you may get a reasonable fit. But most people do not have perfectly standard proportions, and fit affects everything: trim, air management, comfort, and how well your undergarments work underneath.
A custom-fit drysuit is built to your exact measurements, typically around 20 individual measurements for a proper fit. The result is a suit that moves with you, holds the right amount of air, and does not fight you underwater.
Custom fit matters most for:
- Divers with non-standard body proportions
- Anyone wearing thick undergarments (cold water)
- Technical divers who need precise trim
- Divers who log significant hours and want long-term comfort
The price difference between a quality off-the-rack suit and a custom suit is often smaller than people expect, especially when you factor in the cost of alterations or the frustration of a poor fit.
Features to Look For
Seals
You will choose between latex, neoprene, and silicone seals at the wrists and neck. Latex is the traditional standard. Neoprene is warmer and more comfortable. Silicone lasts significantly longer and is hypoallergenic. A quick-change seal system (QCS) lets you swap a damaged seal in seconds without glue or tools, which is worth considering if you travel or dive frequently.
Zippers
The waterproof zipper is the most expensive single component on a drysuit. Masterseal polymer zippers are the industry standard. A bronze zipper upgrade offers better salt corrosion resistance and smoother operation over time. A protective outer zipper shields the waterproof closure from grit and impact, adding years to its life.
Valves
Look for a chest-mounted inflator valve that connects to a standard low-pressure hose, and an adjustable auto-dump exhaust valve on the upper arm. These are standard on quality suits. For long dives, a P-valve (relief valve) fitted during construction is far better than having one retrofitted later.
Boots
Integrated hard-sole boots handle shore entries and boat decks. Neoprene socks with separate rock boots give you a slimmer profile in the water and let you swap boot styles. Both work; it comes down to how you dive.
Budget Considerations
Cheap drysuits are expensive in the long run. Zipper failures, seal replacements, poor fit leading to undergarment issues, and early material degradation all add up. A well-made custom suit that lasts 10-15 years with proper maintenance is almost always a better investment than a cheap suit that needs replacing in 3-5 years.
Budget roughly breaks down into:
- Entry-level off-the-rack: Lower upfront cost, but fit compromises and shorter lifespan
- Mid-range custom: Good materials, proper fit, solid value for most divers
- Professional-grade custom: Reinforced materials, premium components, built for demanding use
The Decision Framework
Work through these questions in order:
- What diving do I do? This narrows your material and feature requirements.
- What water temperature? This determines undergarment needs and therefore fit requirements.
- Custom or off-the-rack? If you dive regularly, custom almost always pays for itself.
- Which material? Trilaminate for most divers. Reinforced or specialist materials for demanding environments.
- Which features? Seal type, zipper, valves, boots. Match these to your diving style.
- What is my real budget? Factor in the total cost of ownership, not just the purchase price.
If you are still unsure after working through these questions, talk to an experienced drysuit diver or a reputable dealer who will ask about your diving rather than pushing a particular product.
Frequently Asked Questions
Is a drysuit worth it if I only dive a few times a year?
It depends on where you dive. If those dives are in cold water, a drysuit transforms the experience. Even for occasional divers, the comfort and safety benefits in cold water justify the investment. For warm-water-only divers who do a handful of dives annually, a wetsuit may be more practical.
Can I use a drysuit in warm water?
Yes. Many technical divers use drysuits in water above 20C for the gas management benefits, pockets, and protection. You simply wear lighter undergarments. Trilaminate suits are especially well-suited to this because they add no insulation of their own.
How long does a drysuit last?
A quality custom trilaminate drysuit, properly maintained, can last 10-15 years or more. The zipper and seals are the components that wear out first and are replaceable. The shell fabric and seams on a well-made suit will outlast most other dive gear.
Should I buy my first drysuit custom or off-the-rack?
If your budget allows it, custom. The fit advantages are significant, and you will not outgrow the suit’s capabilities the way you might with a budget off-the-rack option. A custom suit that fits perfectly from day one also makes learning drysuit skills easier because you are not fighting excess air or restricted movement.
What is the most important feature on a drysuit?
Fit. Everything else, including material, seals, zippers, and valves, matters less than how well the suit fits your body with your chosen undergarments. A perfectly fitting suit with basic components will outperform a poorly fitting suit with premium everything.