The Alba Optics Delta CRST VZUM F Lens FLM photochromic sunglasses are stylish and versatile and claim to be handmade in Italy, but they’re pretty expensive and have no adjustability.
In the cardboard box, the glasses come in a nice soft bag with a quirky lanyard that can be clipped to the end of the arms so they can hang around your neck. This is a nice touch that perhaps leans more towards casual wear or multi-sport use rather than cycling, but it backs up the 80s and 90s styling. There’s also a microfibre cloth for cleaning, and a certificate of authenticity.
The frame is made of Tr90, which Alba says is “made from nylon and carbon fibre” that “offers more protection against crashes and tractions”. I can’t say this is something I often think about, but in a world where counterfeit or off-brand products of questionable provenance are becoming more and more common, assertions that the materials used won’t shatter into a thousand shards of plastic upon impact is actually quite reassuring information – even if I can’t directly verify it in this review.










Large lenses are a mainstay of cycling aesthetics nowadays, and the Deltas are no different. The VZUM is large enough to cover all of my peripheral vision, and I really like the look. I tested the clear frame with the FLM photochromic lens, which is tinted pink for low light, and becomes a mirrored blue when exposed to bright sunlight.

The lens itself is the real standout feature for me. There are three thin ventilation slits across the top of the glasses which do a great job of preventing fogging, and the clarity in both their ‘OFF’ and ‘ON’ tint is first class. I never found myself squinting; wishing the lenses would transition more quickly. Nor did I find myself reaching to take them off as it got darker. The photochromic function simply worked exactly how you’d want it to.
For me, the frame and the overall fit of the glasses was a bit of a letdown. Whilst the glasses are available with an ‘Asian Fit Nosepad’ at the point of ordering, they have no adjustability in either the nose piece or the arms. The fit across the bridge of my nose was okay, but I’d have loved to pinch it up ever so slightly tighter.

The arms have a unique curve to them, which looks great, but I found this made them just a bit too short to reach all the way over my ears to hook the glasses securely in place. The arms are quite short (a good centimetre or so shorter than my regular Oakleys) and I found they pinched above my ears and caused a bit of discomfort on longer rides.

Whilst I do have a bigger than average head, I still squeeze into a medium size helmet, so I’m in no way an anomalous test size. These glasses are sold as “Wide – Universal Fit”, but I found them just a bit too small to be perfectly comfortable. The other side effect of the curve in the arms is that they just won’t sit securely inside any helmet vents. I tested this in a few different helmets from Kask, POC, and Scott, and couldn’t get them to sit nicely in any of them. A small bugbear, but something I really value in eyewear.

Now we get onto the subject of the price. Whilst I think the lens is really good, and I appreciate the fact the glasses are handmade in Italy, I think £180 is quite steep. Bigger brands like Oakley charge similar for their photochromic options like the Sutro at £179.
Other options like Sungod’s GTs, Rudy Project’s Tralyx, and KOO’s Alibis all come in a touch more expensive at £200 or over, but – of course – nothing comes close to the value of the Van Rysel’s NXT Photochromic at just £79.99.
Overall, I think the Alba Optics Deltas are a stylish pair of sunnies with a really good lens that works well in almost all light conditions. The aesthetic is cool and, whilst the fit didn’t work too well for me, that is – to some degree – personal. I would have loved to have seen more adjustability for the price, but if you get on with the fit then these are a great option.
Test Report
What does the manufacturer say about this product?:
Alba Optics says the Delta CRST VZUM F Lens, “Guarantees excellent visibility and protection, both in poor and intense light conditions.”
Tell us some more about the technical aspects of this product:
Frame: CRST
Lens: VZUM™ F-LENS FLM
Fit: Wide – Universal
Lens OFF tint: pink
Lens ON tint: blue mirror coating
CAT (1÷3)
— Ventilated VZUM™ lens to help prevent fog
— Interchangeable VZUM™ lens
— Ergonomic temple tips
— Compatible with the Optical Clip
— Lighter Tr90 frame
— Weight: 26g
— Handmade in Italy
Any further comments on quality?:
The glasses feel like they are built to a good standard but lack a few features that would really elevate them to excellent.
Any further comments on performance?:
The photochromic lens was good, but the frames let down the overall package.
How does the price compare to that of similar products in the market, including ones recently tested?:
I think the £180.62 price is in line with other photochromic sunglasses from mainstream brands like Oakley.
Any further comments on fit?:
I wouldn’t say the glasses are uncomfortable, but the arms are quite short and led to some pinching and discomfort over time. The frames have no adjustability in either the arms or the nosepiece, so if they don’t fit quite right you’re a bit stuck.
Any further comments on weight?:
26g is fine for a pair of sunglasses
Any further comments on comfort?:
I didn’t find the glasses to be particularly comfortable. The short arms dug in just above my ears and led to some discomfort on longer rides.
Any further comments on lens quality?:
The lens quality is great, and the photochromic adjustment is reactive and sharp in both its low light and bright tint.
Any further comments on lens field of vision?:
Due to the size of the lens, the field of vision is great.
Any issues with durability?:
After a month or so of testing, the hinges still feel crisp and positive, the lens is not showing any massive signs of wear, and there’s nothing to suggest the sunglasses are degrading any quicker than you’d expect.
Did you enjoy using the product? Yes
Would you consider buying the product? Yes
Would you recommend the product to a friend? Yes
Use this box to explain your overall score
Whilst I didn’t find the glasses to be too comfortable, if you had a smaller head you may get on well with these. The lens quality is really good, and the photochromic tint works well.
About the tester
Age: 30Height: 175cmWeight: 67kg
I usually ride: Road (Tarmac SL7)My best bike is:
I’ve been riding for: 10-20 yearsI ride: Every dayI would class myself as: Expert
I regularly do the following types of riding: Road racing, Time trialling, Cyclocross, Commuting, Mountain bike XC, Mountain bike Enduro, Mountain bike downhill/freeride



