NanoClear™ vs absorption-based coatings
Both aim for a clear film of water. They get there differently.
Most anti-fog goggles use a hydrophilic coating that works by absorbing moisture. The coating takes in water vapour and swells slightly, which stops droplets forming, and further condensation then spreads across the surface as a film. It is a sound idea, and it is why so many goggles work well out of the box.
The limitation is capacity. An absorbing coating holds a finite amount of water. As it becomes saturated, or as it wears and picks up oils and residue, it absorbs less, droplets begin to form, and the lens fogs. Think of a sponge that is already full.
NanoClear™ does not rely on absorbing water. Its hydrophilic nanoparticles are embedded in a hardened layer and attract water molecules to the lens surface, holding them in a thin film. The effect comes from the surface itself, so there is no reservoir to fill up. NanoClear™ is designed to keep lenses clear up to 10 times longer than traditional coatings.
| Absorption-based hydrophilic coating | NanoClear™ | |
|---|---|---|
| How it stops fog | Absorbs moisture, then spreads water as a film | Embedded nanoparticles attract water into a thin film |
| Water capacity | Limited; can saturate | No absorption reservoir to fill |
| Structure | Coating applied to the lens surface | Nano-embedded hardening layer |
| When it stops working | Saturation, wear or residue | Residue blocking the nanoparticles |
| How to restore it | Often a spray, gel or replacement | Wet the lens and swipe with your thumb |
| Longevity | Varies; can wear or saturate | Up to 10x longer than traditional coatings |
The practical difference
With an absorbing coating, fogging often means the coating is spent. With NanoClear™, fogging usually means the surface is dirty, and a thumb swipe fixes it.