Swiss Material™

All Numa frames are crafted from our patented Swiss Material™, a dependably sturdy, yet also flexible and extremely lightweight fiber. The advanced characteristics of this material, together with our dedication to the highest level of design and quality standards, place Numa Tactical on the cutting-edge of its field. We would have it no other way, for our customers depend on our gear under the most intense conditions and in the harshest climates.

Swiss Material System™

Numa Tactical Eyewear strives to optimize performance, functionality, comfort, and style. We have met this challenge through our proprietary Swiss Material System � � a combination of material and design that bring together the state of the art in both optical engineering and ergonomic principles.

Key structural details of Numa frame engineering:

  • Composed of our unique Swiss Material, a patented flexible and virtually unbreakable fiber
  • Reinforced at what are typically vulnerable points: hinges and bridge of nose
  • Rubberized at point of contact with face to prevent slippage (temple and/or nose pads)
  • Vented lens design on extreme-wrap models, to allow moisture escape and prevent fogging

Tough-Flex(TM) Frame Material

When JB was searching for the frame material that would make his eyewear as tough as the rest of his gear, he discovered Tough-Flex, an extremely lightweight and flexible Swiss memory fiber originally engineered for use in molding ski-boot buckles. With that history, it is no surprise that Numa's Tough-Flex frames can withstand extremes of temperatures, from arctic cold to desert heat without degradation. It is stiff like plastic when at rest, but flexes under pressure, torque or flexion, and so will not break under impact or other conditions of duress. Whether they are crushed in your pack or dropped from a height, your Tough-Flex frames will be there when you need them. The advanced characteristics of this material, together with our dedication to the highest level of design and quality standards, place Numa at the cutting-edge. 


Lite-Flex(TM) Frame Material

To respond to the needs of those endurance athletes for whom lightness is even more important than toughness, we developed our Lite-Flex frame designs and material. Here's how it happened: First we created thinner frame designs to reduce total frame volume and mass. Then we found that we needed our frame material to be marginally stiffer in order to retain performance-level rigidity in these designs. This led to the engineering of Lite-Flex, a slightly lighter, less dense, stiffer, but still flexible, new fiber. Between frame design and frame material, every Lite-Flex frame shaves off an additional couple of grams in comparison with our Tough-Flex designs.


Light Filtration

Different lighting conditions demand varying degrees of light filtration.  The European Light Filtration Standard (EN 1836:1977) divides lenses into 5 categories of filtration (FC0-FC4) based on the percentage of visual light transmitted through the lens.  Numa lenses fall into categories FC0-FC3.  Refer to the Light Filtration Chart below to see which of our lenses are right for your intended usage.

Neither light filtration level nor tint affect the level of UV protection. All Numa Tactical lenses, including Clear, provide 100% protection from all UV light.

Light Filtration Chart

Protection Filter Class (FC)

Filter 0

Filter 1

Filter 2

Filter 3

Filter 4


Clear, slightly tinted

Light tint

Medium Tint

Dark Tint

Very dark Tint

Visible Light transmitted

81 – 100%

44- 80 %

18 – 43 %

8 – 17%

3 – 7%

Numa Lenses

Clear, Reflective Clear

Low-light Orange, Yellow Polarized, Blue Fire


Reflector lenses



Dawn, twilight,
cloudy weather, protection against wind and debris

Partly cloudy skies; as blue-blocker to increase visual acuity

General use sun protection. Partly sunny to sunny days.

Beach, mountains, sunny days

Glacier hiking, high mountaineering close to the sun, conditions of extreme light radiation

UV A / -B/ -C rays blocked







Polarized lenses are recommended for many outdoor activities, especially fishing, kayaking, boating or any other activity where you want to eliminate the glare from a reflective surface.

Glare results from light rays hitting your eye from several directions simultaneously, as when the sun’s rays are reflected off of a body of water.  While tinted lenses block a percentage of all light from reaching the eye, polarization fulfills a more specialized function, by specifically filtering out reflected light. 
When light reflects off an object it usually changes its orientation, and is therefore not in sync with the primary light source.  Polarized lenses block the reflected rays by allowing only light traveling on one plane to pass through the lens.  What reaches your eye is the light from the primary light source.  The result of this is glare elimination that does not depend on the tint of the lens: Polarized lenses can eliminate reflected glare more effectively than regular lenses without having to be as dark.  The benefits of this will be explained below. 
Polarized lenses are crucial to fisherman not just because they minimize eye fatigue by reducing glare, but also because they eliminate the “mirror effect,” transforming the water’s surface from a “mirror” that reflects light into a “pane of glass” which they can look through.  This allows the fisherman to see the fish and rocks beneath the surface.  To illustrate the above point, try looking at a body of water on a bright day, or at the windshield of a car in a parking lot.  The external light source naturally causes the surface of the water or window to act as mirror.  Now put on your Numa polarized eyewear, and that mirror becomes as translucent as a pane of glass.  Now you can see the rocks and fish beneath the water’s surface, or the inside of the car in the parking lot example. 

Our Low-Light Yellow Polarized lenses were designed to filter out only a small percentage of visible light while still blocking out reflected light rays, thus allowing the user to see beneath the water’s surface even in poor-light conditions (i.e.- when it is too dark to use the Smoke polarized lenses).

Numa Polarized Lens Options:  Smoke, Low-Light Yellow

Coming soon: Amber for medium light and Rose for low-light conditions

OpticShield Lenses™

Numa's proprietary multi-layer N-621(TM) polycarbonate, 9.3x as impact resistant as CR-39, with a refractive index of 1.59. Treated with ffront and back performance-enhancing layers: anti-smudge hydro-oleophobic, anti-scratch NumaPlate(TM) hard coat and anti-glare 6-layer anti-reflective coating.


The Electromagnetic Spectrum

Visible light represents just a narrow bandwidth of wavelengths in the electro-magnetic spectrum.  It is bound by ultraviolet (UV) light (invisible) on the higher energy side and infrared (also invisible) on the lower energy side.  Visible light is emitted by or reflected off of the objects around us, allowing us to sense those objects with our eyes.  Our eyes are very highly evolved, sensitive instruments.  Unprotected, with a lot of outdoor exposure, our eyes can be damaged by the ultraviolet light that is emitted from the sun.  UV light can damage the cornea, retina and lens.  Numa lenses are engineered of the finest quality polycarbonate, and laboratory-tested to block 100% of ultraviolet light, protecting the eye from that exposure.


Light is divided into 3 wavelength ranges:  

Ultraviolet (UV)

0 - 380 Nm

Visible Light

380 - 780 Nm

Infrared (IR)

780 - 2000 Nm

1 Nanometer (Nm) = 10-9 meters    

Visible Light

Light waves range in wavelength and frequency, but always travel at the same speed (“the speed of light”). Visible light consists of light waves falling within the wavelength range of 380 to 780 Nm (nanometers).  Within that visible range, the intensity of light can affect a person’s visual perception.  As the eye reacts to intense light, there is an immediate degradation of vision – visual acuity, depth perception and color perception decrease dramatically.  For this reason, sunglasses that filter out some light can improve an individual’s sight in strong light conditions.  This is especially noticeable on bright sunny days, out on the water, or on a snowy or icy mountain.

UV Rays

Ultraviolet (UV) light is constantly emitted by the sun.  Scientists subdivide the UV spectrum into 3 subcategories: UVA, UVB and UVC.  UVB is recognized as the dangerous part of the spectrum while UVA and UVC are most likely harmless. 
UVB rays cause sunburn and can damage the eye’s cornea, retina and lens. Combined with cold wind and snow, UVB also has the potential to cause snow blindness (photokeratitis), a temporary (1- to 4-day) but painful problem.  Also, there is some research that suggests that daily exposure to UVB in very bright sunlight over a period of many years may cause cataracts, a gradual clouding of the lens of the eye. 
UVA rays are primarily absorbed within the lens of the human eye.  There are no documented cases of UVA causing eye disorders, though this remains a much debated and researched area. The wavelength of UVC rays is closest to that of visible light, and most experts agree that they are of little concern as they are absorbed by the upper atmosphere and do not reach earth's surface. 
UV damage is cumulative over a person's lifetime, which means you should begin protecting your eyes and your children’s eyes as soon as possible.  Your wellbeing is very important to us at Numa Tactical, and all of our lenses offer 100% protection against light wavelengths up to 400nm, thereby blocking 100% of all three classes of UV rays. 

UV Light Classes, by wavelength


315 - 380 Nm


280 - 315 Nm


< 280 Nm



Shark & Chisel

shark and chisel

Rider (Swat)


Sparta (FlexFrame Release)


Point, LoPro & Explorer


Whip ("One-Clik" Lens Change System)