The Koo Alibi regular fit sunglasses are hands down the best 'small face' compatible eyewear I've ever used

I have a small face. I've always found this fact strange because I'm not aware of my head looking disproportionately small atop my body (others may say differently). However, evidence that this an undisputable fact has followed me throughout my life: as a young adult, handing a child a small helmet that "fits me", only to discover it was far too tiny; the fact that some 'small' helmets still fail to meet the circumference of my head; and, the difficulty in finding sunglasses that do not envelop my features beyond what is normal in the age of 'bigger is better'.

If you share my woes, I have good news: the Koo Alibi may be the best cycling sunglasses you'll ever find. I've tried several pairs of 'narrow', 'small' and 'junior' glasses, and these represent the superlative, thus far.

Koo Alibi sunglasses: construction

The Koo Alibi glasses are available in 'regular' and 'large' fit, the former is designed for 'narrow faces'. Having previously only found comfort in the likes of 100%'s 'XS' (Extra Small) Speedcraft glasses, and Oakley's Radar EV 'Youth Collection' glasses, I'd suggest naming these 'Small' and 'Regular' might have been more accurate, but I'll leave that naming quirk with the marketing department.

The glasses utilise a 'half-frame design', meaning there is no frame on the lower half, which is my preference as it avoids any chance of a bulky plastic section invading the view mid-ride. The arms curve very slightly, which creates a reassuring feeling of being 'locked in', even if I vigorously shake my head (or, find myself rattling down an off-road trail). This fit is aided by secure nose pads, which sit flush as they should, and consist of one long pad on each side, attached via two plastic prongs. This is an area where I've seen glasses fail, long term, as overly fragile pads don't respond well to abuse if you're not the kind of person who consistently utilises a hard case (I am not), but Koo's design appears solid.

The glasses are available in 12 different configurations, which dictate both the (aesthetic) frame colour, as well as the lens colour, the latter has implications upon the best conditions for use. I tested the 'Galaxy - Metallic Pink / Super Pink Mr', which offers 11% Visible Light Transmission (VLT) and falls into filter category 3. All of this means that these are glasses for riding under bright, sunny skies. However, alternative lenses are available for other riding conditions (£45-90/$62-$115).

The lenses come from market leader Zeiss, and feature ventilation holes to guard against fogging.

Koo Albili sunglasses: the ride

From the moment I put these glasses on, they were a winner for me. The close fit offers a feeling of security, with no interference when paired with a helmet (I tested these wearing a Specialized Evade, and the Giro Aries).

The lenses were crystal clear in the sunshine, blocking out the rays and providing a clear view of the roads and trails ahead. When caught in a sudden, heavy shower, I could see clearly and didn't feel the need to whip the glasses off as the drops grew heavier.

Stopping at lights, the lenses didn't fog up, either. Though, interestingly, I notice this has been the case over the last few pairs of sunglasses I've tested, once a constant bugbear, this does appear to have improved across the board.

I did test these lenses on gravel trails, shaded by low-hanging trees, and on overcast days. These are not the conditions they're designed for, and they didn't excel in the way they do in bright light. However, I wouldn't have any qualms about using this lens until deep winter, when I would want to swap to a clear, photochromic or more suitable option. Thankfully, all six replacement lens options are available in both 'regular' and 'large' fit.

What truly sets these glasses apart is that they embody a more modern (fashionable), large-frame style, in a smaller package. So far, suitable glasses I've tested have offered excellent visibility, and 'youth' or 'extra small' options have been effective. However, the Alibi from Koo is the first I've tried that really nails the fit alongside a more en vogue aesthetic.

Koo Alibi sunglasses: value

Koo's Alibi glasses cost between £170-£210 ($190-$235), depending upon the lens and frame selection, the pair on test will set you back £170 ($190), with replacement lenses from £45-£90 ($62-$115).

This positions the glasses in the midline vs competitors, 100%'s Hypercraft XS comes in between £112 and £131, the Speedcraft XS from £112 to £175. Oakley's Sphaera, comparatively, starts at £190 and climbs to £230.

Whilst clearly an investment, these glasses provided an excellent fit which I've struggled to find elsewhere, so, they come highly recommended.

My only criticism is that the glasses arrived supplied in a cardboard box, with a soft case, a lack of a hard case does feel like a let-down considering the relatively premium price tag.

Koo Alibi sunglasses specification

• Weight: 25g
• RRP: £170-£210 ($190-$235)
• Lens: 11% Visible Light Transmission (VLT), filter category 3