No photochromic lens can respond instantly to changing conditions, but these seem as fast as others I've used. I never became aware of any lag, and they seem to handle rapidly changing conditions – such as riding through patches of trees – pretty well. The glasses have solid frames and a curved, face-hugging wraparound lens that mostly fills the field of vision. Peripheral vision at the sides is completely covered. The lenses have vents top and bottom and I found these to be very effective. Even on cold days, these glasses never misted up when I was moving. I occasionally got a little mist when I stopped at junctions after hard efforts on really cold days, but that cleared the instant I started to move again. Experience the Alliant difference today and redefine what's possible in baseball, cycling, running, endurance sports, or triathlons. Discover the perfect fusion of style, functionality, and performance for your athletic endeavors. Using an innovative new shield lens design, the Alliant is undoubtedly the model of choice for the ultimate competitor. Given the quality – and that they're currently available considerably below RRP – it's not hard to recommend the Tifosis for all-day riding. Verdict

The all-around Gunmetal Alliant comes equipped with Tifosis most versatile Fototec Light Night photochromatic lens, with a Light Transmission range from 27.7% ( fairly dark ) - 75.9% ( virtually clear ). Light Night is colour-neutral for zero colour distortion. Non-mainland deliveries are subject to courier availability and capacity and may be liable to unforeseen delays.Say goodbye to fogging and distractions. Alliant's vented lenses improve airflow, maintaining clear vision throughout your most demanding activities. Stay cool under pressure and keep your eyes on the prize. The Tifosi Alliant Light Night Fototec sunglasses are well vented and well made, with photochromic lenses that make them suitable for a very broad range of conditions. The long, curved arms mean they don't sit comfortably with every helmet, but as long as they work with yours, these are a solid choice for all-day riding. Building and expanding on the success of the Tifosi Davos, the Alliant offers a multi-vented half frame design to take your performance to the next level. Using an innovative new shield lens design, the Alliant is undoubtedly the model of choice for the ultimate competitor.

Finance is subject to application, financial circumstances and borrowing history. Performance Cycling Limited FRN: 720557 trading as Tredz are authorised and regulated by the Financial Conduct Authority. We are a credit broker not a lender – credit is subject to status and affordability and is provided by Mitsubishi HC Capital UK PLC. Terms & Conditions Apply. The only real niggle I have with the glasses concerns their arms, which are quite long and curved downwards. I've got quite a big head, but even so the arms extend at least a couple of centimetres past the point where they rest on my ears. Generally, this wasn't a problem, but it did mean that they wouldn't sit well with some helmets. I tried them with three helmets that I currently have around the house. They were entirely fine with a Livall helmet I was testing, but they occasionally got nudged by my Ekoï helmet, and really didn't get on all that well with my main helmet, which is a Kask Infinity. Here, the long arms ran foul of the plastic cage that grips the head and this often led to the glasses being pushed forward off my nose. So if you wear a helmet that wraps close behind your ears, just be aware that you might have a similar issue. With a light transmission range from 27.7% to 75.9%, the Tifosis can be used in complete darkness and all but the brightest summer sunshine, coping with the changing weather conditions that can happen during a ride, or the transition between sunshine and shade. These Tifosi Slice Fototec Light Night Lens sunglasses offer excellent all-round visibility thanks to their frameless design, and the tint range of the photochromatic lens covers the majority of riding conditions even into the darkness. The wind can whip around the sides a bit, though, which won't please hayfever sufferers or those with sensitive eyes.Experience the power of sleek angles and premium materials that define Alliant as the go-to performance eyewear. Engineered to meet the demands of athletes, Alliant sport sunglasses excel in every aspect. Vented lenses enhance airflow, keeping you cool and focused, while the adjustable ear and nose pads, featuring hydrophilic rubber, ensure a perfect and stable fit, even during intense workouts and triathlons.