Snow Goggles Terminology Explained
1. Basic Structure
Lens Types
Spherical Lens: Curved like a sphere, wider view, anti-distortion.
Cylindrical Lens: Flatter vertical curve, lightweight.
Dual-Pane Lens: Two layers + air gap for anti-fog.
Frame
TPU Material: Flexible and cold-resistant.
Face Foam: Breathable memory foam for comfort.
2. Optical Tech
The color of ski goggle lenses is primarily determined by their Visible Light Transmission (VLT), which is categorized into five levels: S0, S1, S2, S3, and S4. These numbers indicate the darkness level of the lens and the amount of light they allow to pass through—not their UV absorption.
(Visual Effects of Lenses with Different VLT)
- S0 (VLT: 80%–100%): Nearly clear or very lightly tinted. Designed for low-light conditions: fog, overcast days, or night/dawn skiing.
- S1 (VLT: 43%–80%): Lightly tinted, ideal for dim or variable light.
- S2 (VLT: 18%–43%): Medium tint, best for moderately sunny conditions.
- S3 (VLT: 8%–18%): Dark tint, optimized for bright sunlight (e.g., midday alpine skiing).
- S4 (VLT: 3%–8%): The darkest lenses, used only when S3 isn’t sufficient (e.g., extreme glare on glaciers). Not suitable for driving due to severely reduced visibility.
Coatings
UV400: Blocks 99% UV rays.
Polarized: Reduces glare but may hide terrain contours.
Amplifier: Enhances contrast in flat light.
Photochromic Lens: Auto-adjusts tint based on light.
3. Functional Features
Ventilation
Top Vents: Release heat to prevent fogging.
Bottom Mesh: Balances airflow.
Compatibility
OTG (Over-The-Glasses): Fits over prescription glasses.
Helmet Clip: Secures to ski helmets.
Quick-Change System: Magnetic or tool-free lens swaps.
4. Key Buying Terms
Fog-Free Certified
Peripheral Vision
Anti-Scratch Coating
Interchangeable Lenses
Pro Tip: Do a “big smile test” to check face seal!