01
Reads
the light.
the light.
A 2.2 mm grey photochromic polycarbonate lens. It darkens as UV gets stronger and clears back up in shade, under cover or indoors, so you stop swapping glasses every time the light changes.
Bastion
$120.00
In stock, ready to ship
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Tested to ANSI/ISEA Z87.1-2025.
Photochromic lens that adapts to the light.
Strap + half and full magnetic foam included.
Product Description
- Tested to ANSI/ISEA Z87.1-2025 – independently tested by Intertek and passed (report SZHH02236904), Z87.1 mark on the lens.
- Photochromic lens – 2.2 mm grey polycarbonate that darkens in the sun and lightens in the shade.
- Silver mirror coating – helps cut down bright glare off sand, metal and water.
- Anti-fog inside – the inner side of the lens is treated to help keep your view clear.
- Tall shield – one-piece 139 x 64 mm lens for wide, top-to-bottom coverage.
- TR90 frame – shine transparent grey, light and flexible, logo laser-marked on both temples.
- Two magnetic foam seals – half foam for the brow, full foam for a sealed fit, EVA with neodymium magnets.
- Arms or strap – wear it as safety sunglasses or swap to the woven strap for goggle mode.
Included With Every Pair
- Half foam seal – brow seal, EVA foam with neodymium magnets.
- Full foam seal – full wrap, EVA foam with neodymium magnets.
- Woven strap – black elastic polyester with Trailvision logo, for goggle mode.
How The Photochromic Lens Works
The Bastion lens reacts to UV light. It darkens as the sun gets stronger and clears back up in shade, under cover or indoors, so one pair covers the whole day. Most car windshields block UV, so the lens darkens less while driving. For night use, choose a clear lens. See every detail on this page.
ANSI Z87.1 Test Report
Bastion was independently tested by Intertek Testing Services to ANSI/ISEA Z87.1-2025 and passed (report SZHH02236904, September 4, 2026). See the report on this page or open the full PDF.
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Bastion
$120.00
Bastion / Safety Series
Full cover.
Every light.
Every light.
Bastion is a tall-shield safety frame with a photochromic lens that darkens in the sun and clears up in the shade. Run it as safety sunglasses, or swap the arms for the strap and lock it in like a goggle. Built on a transparent grey TR90 frame and tested to ANSI/ISEA Z87.1-2025.
ANSI/ISEA Z87.1-2025 / Z87.1 marked lens
Z87.1Tested to ANSI/ISEA 2025
2.2mmPhotochromic PC lens
x2Magnetic foam seals, free
139x64Size, millimetres
Anatomy
Every detail
earns its place.
earns its place.
01 / 07
02
Silver out.
Fog-free in.
Fog-free in.
A silver mirror coating on the outside cuts down bright glare. An anti-fog treatment on the inside helps keep your view clear when you are working hard or the air is cold and damp.
03
Z87.1
on the lens.
on the lens.
Tested to ANSI/ISEA Z87.1-2025, the American standard for occupational and educational eye protection. You will find the Z87.1 mark on the lower corner of the shield and the Trailvision logo laser-marked on the lens.
04
Tall shield.
Wide view.
Wide view.
A one-piece 139 x 64 mm shield wraps your field of view top to bottom, with no center seam in your line of sight. More coverage against dust, debris and wind from the front and the sides.
05
Bends.
Doesn't break.
Doesn't break.
Shine transparent grey TR90, a lightweight, flexible nylon that takes knocks and pressure instead of cracking. Trailvision logo laser-marked on both temples and BASTION on the inside of the arm.
06
Two foam
seals.
seals.
Pick your seal. The half foam runs along the brow to stop sweat and debris from dropping in. The full foam wraps the whole frame for a sealed, goggle-style fit. Both are EVA foam with neodymium magnets, so they snap on and off in seconds.
07
Arms or
strap.
strap.
Wear Bastion as safety sunglasses with the TR90 arms, or swap them for the elastic woven Trailvision strap and wear it like a goggle. One frame, two ways to lock in.
Photochromic lens
One lens.
Every light.
Every light.
No clip-ons to carry and nothing to swap. The Bastion lens reacts to UV on its own, getting darker as the sun comes out and lighter as it fades.
Near clear
Under cover, in the shop or on a grey morning, the lens stays light. Lab tested at 86 to 89% light transmission in this state.
Adapting
Moving between trees, clouds and open ground, the tint shifts with the light instead of making you stop and change glasses.
Dark + silver
In bright sun the grey deepens, and the silver mirror coating helps knock back harsh glare off sand, metal and water.
Photochromic lenses react to UV light. Behind a car windshield, which blocks most UV, the lens will darken less. The change also takes a little time, and it is a bit faster in cold weather than in heat.
Two ways to wear it
Glasses.
Or goggles.
Or goggles.
Same shield, same lens. Switch setups in a minute depending on the job, the trail or the weather.
Safety sunglasses
Flexible TR90 arms for everyday wear. Add the half foam along the brow to stop sweat and dust from dropping in behind the lens.
Goggle mode
Take the arms off, clip in the elastic woven strap and snap on the full foam seal. A closer, sealed fit for dust, wind and fast riding.
In the box
Everything.
No add-ons.
No add-ons.
Every pair ships ready for both setups. Nothing to buy later, nothing left out.
Bastion frameShine transparent grey TR90 with arms
Photochromic lens2.2 mm grey PC, silver coating, anti-fog inside, mounted
Half foam sealBrow seal, EVA foam with neodymium magnets
Full foam sealFull wrap, EVA foam with neodymium magnets
Woven strapElastic polyester, Trailvision logo
Get
BastionBack to top / Add to cart
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Tech specs
The
numbers.
numbers.
- Standard
- Tested to ANSI/ISEA Z87.1-2025, Z87.1 marked lens
- Frame
- TR90, shine transparent grey
- Lens
- 2.2 mm grey photochromic polycarbonate (PC)
- Coatings
- Silver mirror coating outside, anti-fog treatment inside
- Size
- 139 x 64 mm
- Foam
- Removable half and full foam seals, EVA foam with neodymium magnets
- Strap
- Black woven polyester elastic with Trailvision logo
- Wear modes
- Sunglasses (TR90 arms) or goggle (strap)
- Branding
- Laser-marked logo on both temples and on the lens, BASTION on the inner temple
- Includes
- Half foam seal, full foam seal, woven strap
Proof, not promises
Tested.
On paper.
On paper.
Bastion was independently tested to ANSI/ISEA Z87.1-2025, the American national standard for occupational and educational eye and face protection. Twelve pairs went through the lab. Read the report yourself.
ANSI/ISEA Z87.1-2025Result: Pass
- Result
- PASSSubmitted Bastion samples
- Standard
- ANSI/ISEA Z87.1-2025
- Test lab
- Intertek Testing Services
- Report no.
- SZHH02236904
- Report date
- September 4, 2026
- Light transmission
- 89.3% left / 86.0% right in the lens's light state (requirement: 85% or more)
- Optical quality
- Luminous transmittance
- Haze
- Refractive power and prism
- Drop ball impact resistance
- Ignition resistance
- Corrosion of metal parts
- Minimum coverage area
- Optical radiation (clear lens)
Test report covers the submitted Bastion samples against ANSI/ISEA Z87.1-2025, excluding Clause 5.3 (Markings) and Clause 10 (Instructions, Use and Maintenance). Bastion was not evaluated for high mass or high velocity impact (Z87+), the optional anti-fog rating, dust or splash protection, welding or other hazard-specific uses. Eye protection does not replace task-specific protective equipment. Inspect before every use, and replace any protector that has taken an impact.
Job site01
Off-road02
Workshop03
Outdoors04
Questions
Straight
answers.
answers.
Is Bastion ANSI Z87.1 tested?
Yes. Bastion was independently tested by Intertek Testing Services to ANSI/ISEA Z87.1-2025 and passed (report SZHH02236904). The lens carries the Z87.1 mark, and you can read the full report in the section above. It is not rated for high mass or high velocity impact (Z87+), welding or chemical splash.
How does the photochromic lens work?
The lens reacts to UV light. It gets darker as the sun gets stronger and lighter in shade or indoors. Most car windshields block UV, so the lens darkens less while you are driving.
Can I wear it at night?
In low light the lens clears up. In its light state it measured 86 to 89% light transmission in lab testing, which is in the clear-lens range for Z87.1. Give it a few minutes to fully clear after coming out of bright sun, and if it still feels too dark for night driving, switch to a clear lens.
Half foam or full foam?
Use the half foam along the brow for everyday wear to stop sweat and dust from dropping in. Use the full foam with the strap when you want a sealed, goggle-style fit against dust and wind. Both snap on with magnets.
How do I switch to goggle mode?
Remove the TR90 arms, clip the woven strap into the hinges on both sides and snap on the full foam seal. Reverse it to go back to sunglasses mode.
What comes in the box?
The Bastion frame with arms and the photochromic lens mounted, a half foam seal, a full foam seal and a woven Trailvision strap.
Titan or Bastion?
Titan is the clear-lens kit with two polarized clip-ons and side shields. Bastion is the one-lens option: a photochromic shield that adapts to the light, with a strap and two foam seals for a goggle-style fit. See Titan.
How do I clean Bastion?
Rinse dust off with clean water, then wipe the lens with a microfiber cloth. Skip abrasive cleaners, which can damage the silver and anti-fog coatings, and store it in a case when you are not using it.
Returns and warranty?
Every order has a 30-day hassle-free return window and a 1-year limited warranty.