BOLD Slayers Photochromic Sunglasses – MTB, Ski & Lifestyle Eyewear

BOLD Slayers Photochromic Sunglasses – Oversized Frame, Light-Adaptive Lens

BOLD is proudly based in Steamboat Springs, CO – Ski Town and Bike Town USA. The Slayers are our largest oversized sunglasses, designed for athletes who demand maximum field of view, all-day comfort, and adaptive performance. Now available with light-sensitive photochromic lenses that adjust automatically to changing light conditions — no swapping, no stopping.

From dim forest trails to sun-exposed alpine ridges, the Slayers Photochromic provide seamless visibility and sharp contrast wherever your adventure takes you — whether that’s mountain biking rocky descents, gravel grinding through wide-open roads, or chasing spring corn turns on snow-covered peaks.

One Lens, All Conditions
With lenses that shift from clear to dark based on the amount of UV exposure, Slayers Photochromic adapt to your environment in real time. They’re perfect for early-morning rides, shady tree tunnels, bluebird ski laps, or long-distance trail runs where light is constantly changing.

Performance Without Distraction
Featuring a wraparound oversized frame, stable nose pads, and lightweight TR90 construction, the Slayers deliver locked-in fit and all-day wearability. No fog. No bounce. No need to stop and change lenses.

Why Photochromic Lenses?
Photochromic lenses adjust to your surroundings, offering enhanced eye comfort and optimal clarity whether you're in low light or full sun. They’re ideal for athletes who move between conditions throughout the day and don’t want to mess with gear mid-session.

Go Bold, Adapt on the Fly
Designed for action, styled for everyday. The clean look of the Slayers pairs as well with your post-ride hangout as it does with your pre-race warmup. Engineered for performance, made for your lifestyle.

Tech Specs:

• Frame Material: TR90 (lightweight and ultra-durable)

• Lens Material: Photochromic, transitions from clear in low light to tinted in sunlight. Adjusts automatically based on conditions — clear under tree cover or in overcast settings, and darkens when exposed to bright sun. Non-polarized.

• Frame Colors: Matte Black, Red/Black, Pink, Blue, Purple

• Fit: Oversized unisex performance wrap

• Designed For: Mountain biking, gravel biking, spring skiing, trail running, and variable-light conditions

• Frame Dimensions: Slayers feature our largest wraparound frame, built to maximize your field of view and keep out wind, dust, and debris.

• UV Protection: Yes

Browse the full BOLD sunglasses collection.

Also check out: Flash Photochromic Sunglasses — another top pick from the BOLD photochromic lineup.

Read our guide: Best Photochromic Sunglasses for Mountain Biking to see how the Slayers compares for trail riding.

Technical specifications

UV protection and certification

What UV400 actually means

UV400 means the lens blocks 100% of ultraviolet light up to 400 nanometres. That covers the whole UV range that reaches the ground, both UVA and UVB. Independent lab testing measured 0.00% transmission across it.

Why UVB matters. UVB is the shorter, higher energy wavelength. Your cornea absorbs almost all of it, which is why the damage shows up fast. A day on snow without protection can give you photokeratitis, which is sunburn of the cornea. It feels like grit in your eyes and usually arrives six to twelve hours after exposure, often in the middle of the night. Long term, UVB is associated with pterygium, a fleshy growth across the white of the eye that skiers and surfers get, and with skin cancer on the thin skin of the eyelids.

Why UVA matters. UVA is the longer wavelength and it does not stop at the cornea. It passes through to the lens inside your eye and on to the retina. You feel nothing at the time, which is the problem. The damage accumulates over decades and is linked to cataracts and to age related macular degeneration. UVA is also present all day, all year, and it passes through cloud, so overcast days are not safe days.

Why it matters more on snow and at altitude. Fresh snow reflects up to 80% of UV straight back at your face, so you take it from above and below. UV intensity also climbs roughly 10% for every 1,000 feet you gain. A bluebird day at 10,000 feet on snow is one of the harshest UV environments most people ever stand in.

One more thing worth knowing. A dark lens with no UV protection is worse for your eyes than no sunglasses at all. The tint makes your pupils open wider, so more UV gets in. That is why the lab number matters and the tint does not tell you anything on its own.

What these standards mean

ANSI Z80.3:2018. The United States standard for non prescription sunglasses. It checks UV blocking, that colours still look natural through the lens, and that you can correctly recognise red, amber and green traffic signals.

ISO 12312-1:2022. The international standard for sunglass filters. It sets the filter category, verifies UV performance, and confirms whether the lens is safe for road use.

AS/NZS 1067.1:2016. The Australian and New Zealand standard, widely regarded as among the strictest in the world for sun protection. It is the one that measures UV blocking all the way out to 400 nanometres, which is where the UV400 claim comes from.

FDA 21 CFR 801.410. The United States Food and Drug Administration requirement for impact resistant eyewear. Every lens is drop ball tested. Impact resistant does not mean unbreakable, but it means the lens is built to resist shattering rather than breaking into fragments near your eyes.