Helping divers make informed decisions about training, gear, skills, and safety at every stage of their journey.

Stream2Sea Professional Mask Defog Review

Mask Defog

My go-to anti-fog solution for both freshwater and saltwater dives. It outperforms spit and baby shampoo, holds up better if your mask floods or gets dunked, and is the only defog I trust to be safe for aquatic environments. Not cheap, but absolutely worth it.

Overall Score: 8.3 / 10

Pros & Cons

ProsCons
Reliable and consistently effectiveMore expensive than DIY options
Resists rinsing when mask is dropped or floodedHarder to find in stores
Lab-tested safe for marine and freshwater environmentsDoes not last for multiple dives without reapplication

Why I Chose Stream2Sea

I’ve tried spit, baby shampoo, and random boat defogs over the years, but I was always chasing something that just worked without needing to reapply constantly or worry about what chemicals I was putting into the water. As a Chicago-based diver, most of my dives are in freshwater quarries or Lake Michigan, and I wanted a defog that wouldn’t fail during cold or rushed kit-ups. Stream2Sea checked those boxes and has never let me down. I’ve shared it with students and buddies who used to rely on baby shampoo or “boat juice,” and every single one reported a noticeable improvement.


Performance in the Water


Verdict

Stream2Sea has become my default mask defog. It’s always in my kit and gets passed around often because it just works better. While it’s not magic and still requires reapplication for every dive, it’s reliable enough to be worth the extra few cents per dive.

Would I buy it again? Yes. This is the only defog I actively recommend and repurchase.


Deep Dive into the Score

Scoring System: Each category is scored out of 10 and weighted by importance. This model is used consistently across all gear reviews for transparency.

Category Score (0–10) Weight Weighted Score
Function & Performance930%2.7
Ease of Use920%1.8
Versatility615%0.9
Durability & Build Quality715%1.05
Value810%0.8
Brand Trust & Transparency1010%1.0
Total8.25

Rounded Display Score: 8.3

Deep Dive Score Explanations