Waterproof vs DUI
D7 EVO vs FLX Extreme - DUI Drysuit
Which one would we buy?
Waterproof
DUI
Scores are our editorial opinion of these models, based on features, suitability and ownership trade-offs—not hands-on test results. How we chose →
We’d pick the D7 EVO.
Our pick is Waterproof D7 EVO. Our favourite here for replaceable seals and a reinforced shell with a plastic dry zipper.
Which one suits you?
Waterproof D7 EVO
Our favourite here for replaceable seals and a reinforced shell with a plastic dry zipper. Confirm the fit with the undergarments you will actually wear.
Get to know this model →DUI FLX Extreme - DUI Drysuit
We like FLX Extreme for its front entry and reinforced leg and knee areas. The separate FLX HD fabric option should not be confused with this version.
Get to know this model →Specifications side by side
The details that matter, side by side. “Check with the brand” means we have not confirmed that detail.
| Detail | Waterproof D7 EVO | DUI FLX Extreme - DUI Drysuit |
|---|---|---|
| Material | Nylotech with reinforced seat and elbows | Polyester / butyl rubber / polyester trilaminate |
| ZipperCheck with the brand | YKK Aquaseal plastic dry zipper | Check with the brand |
| Wrist systemCheck with the brand | Flexlock replaceable silicone seals | Check with the brand |
| Neck systemCheck with the brand | SI TECH Quick Neck | Check with the brand |
| Included bagCheck with the brand | TPU roll-top dry bag | Check with the brand |
| ReinforcementCheck with the brand | Check with the brand | Cordura leg/knee overlays |
| EntryCheck with the brand | Check with the brand | Diagonal front zip |
| FitCheck with the brand | Check with the brand | Telescopic torso; internal waist adjustment |
| Variant cautionCheck with the brand | Check with the brand | FLX HD is a separate fabric option |
Showing all 9 specification rows.
What the differences mean when you buy
Shell and construction
Waterproof D7 EVO
- Material
- Nylotech with reinforced seat and elbows
DUI FLX Extreme - DUI Drysuit
- Material
- Polyester / butyl rubber / polyester trilaminate
- Reinforcement
- Cordura leg/knee overlays
Compare the actual shell, reinforcement and lining rather than treating all trilaminates as equivalent. Denier, fabric mass and neoprene thickness measure different things. An integrated mesh lining changes the system being evaluated, but does not establish a universal exposure limit. Durability claims need suitable testing, not just a material name.
Entry, fit and boots
Waterproof D7 EVO
- Zipper
- YKK Aquaseal plastic dry zipper
DUI FLX Extreme - DUI Drysuit
- Entry
- Diagonal front zip
- Fit
- Telescopic torso; internal waist adjustment
Fit the suit over the undergarments intended for use and check reach, bending, boot fit and entry. A quoted weight applies to its named size and configuration; do not compare it with an unweighed made-to-measure order. Front and rear entry create different dressing requirements that should be tried before purchase.
Seals, pockets and ordered options
Waterproof D7 EVO
- Wrist system
- Flexlock replaceable silicone seals
- Neck system
- SI TECH Quick Neck
DUI FLX Extreme - DUI Drysuit
- Variant caution
- FLX HD is a separate fabric option
Write down the exact neck and wrist system, replacement parts and pocket configuration. Similar model names can use different rings and zippers. A field-replaceable seal system is useful only with the correct spares and knowledge; it does not make unrelated components interchangeable. Confirm current production changes and the options on your quotation.
A closer look at both
D7 EVO
The D7 Evo updates Waterproof’s Nylotech drysuit design with Flexlock wrist rings and a flexible YKK Aquaseal plastic dry zipper. Flexlock has a viewing window to check seal placement. The suit combines this replaceable-seal arrangement with reinforced seat and elbow areas, SI TECH valves and pockets that include a separate compartment in the lid.
What we like
Our favourite here for replaceable seals and a reinforced shell with a plastic dry zipper.
What would make us think twice
Confirm the fit with the undergarments you will actually wear.
More about the D7 EVO →FLX Extreme - DUI Drysuit
The FLX Extreme is a polyester/butyl-rubber/polyester trilaminate drysuit with a thicker rubber layer than the TLS350 and Cordura overlays on the legs. Its diagonal front zip, telescopic torso and waist adjustment are intended to preserve movement while adding protection. DUI also offers an FLX HD fabric option, which should be specified separately.
What we like
We like FLX Extreme for its front entry and reinforced leg and knee areas.
What would make us think twice
The separate FLX HD fabric option should not be confused with this version.
More about the FLX Extreme - DUI Drysuit →Four checks before you place an order
- Arrange a full fitting over the intended undergarments, including boot and fin compatibility.
- Check the actual entry procedure and range of movement with qualified fitting assistance.
- Record the ordered seals, rings, zipper, boots, pockets and alterations in writing.
- Ask about suitable training, servicing, repair turnaround, replacement seals and warranty conditions.
Ask for a quote for the complete kit, including the accessories you need. That makes the price comparison much more useful.
Price, accessories and owning the equipment
Price the complete exposure system, including undergarments, any dry-glove arrangement, alterations and required spares. Made-to-measure and stock suits can have different delivery and return conditions. A base price comparison becomes misleading if one quote includes boots or seal systems that the other treats as options.
Changing suit construction should prompt a review of fit and equipment compatibility with qualified support. A drysuit comparison is not operational training. Follow the model’s zipper, seal and storage instructions, and avoid assuming that a repair method or spare from another model is suitable.
How we scored these models & further reading
These are our subjective buying scores out of 100. We weigh the usefulness of the features, the intended diving or carrying job, and the compromises involved in owning the gear. They are not laboratory measurements, safety grades or customer averages. The verdict applies to the two named models, not everything either brand makes.
90–100: one of our first choices for the stated job. 80–89: a strong option with trade-offs. 70–79: a more specific fit. A different fit, camera, valve or dive plan can change which one you should buy.
Questions worth settling
Does the suit material tell me how warm I will be?
No. The whole exposure system, including undergarments, fit, conditions and duration, needs assessment. A shell material or nominal neoprene thickness does not provide a safe temperature limit, and we do not have a controlled thermal test establishing a winner.
Which is the better buy for this particular comparison?
Confirm the fit with the undergarments you will actually wear. We like FLX Extreme for its front entry and reinforced leg and knee areas.
Our pick is where we would start. Choose the other model if its fit or features better match your setup—especially where a camera, valve, boot or exposure suit needs an exact match.
