The Smith Syncline sunglasses are built for riders who want near-goggle levels of coverage without wearing goggles. They are big, protective and very obviously designed for mountain biking, with a wide shield lens, ChromaPop optics, adjustable contact points and a bonus clear lens for properly low-light rides.

This review of the Smith Syncline sunglasses comes from riding them on a woodland trail, where light conditions were constantly changing. That is exactly where riding glasses can either make life easier or become a problem. Dappled light, shadows, low-level woodland brightness, rocks, roots and small branches all challenge the lens in different ways. If you’re after some sunglasses for your MTB riding, check out our buyers guide to the best MTB sunglasses.

The Syncline impressed most through the ChromaPop lens. It handled changing woodland light extremely well, making the trail surface and rocks easy to read. Small tree branches occasionally appeared a little late, which may be partly down to lens tint and the messy nature of woodland light, but overall visibility was excellent. Add the large protective shape, comfortable soft arms and lack of pinch points, and the Syncline feels like a very strong MTB and eMTB riding glass.

Smith Syncline Sunglasses: Review

ChromaPop lens performance

The best part of the Smith Syncline is the lens. Riding through woodland in dappled and low-level light can be awkward because the eye is constantly adjusting between shade, shafts of sunlight and darker patches under trees. The ChromaPop lens handled that really well.

Trail detail was easy to pick out, especially rocks, ground texture and the main line ahead. That matters on an eMTB because you can carry speed quickly, and poor lenses can make the ground feel flatter or more confusing than it actually is. The Syncline made the trail surface easier to read and gave a clear, calm view through changing light.

The only slight issue was with very small branches. Fine twigs and smaller overhanging details could appear a little later than ideal. I would not describe that as a major flaw, but it is worth noting for tight woodland riding. The bonus clear lens should help on darker rides, and lens choice will matter if your local trails are heavily forested.

Coverage and protection

The Syncline is a big pair of glasses, and that is a good thing for mountain biking. The lens gives a wide field of protection and feels close to goggle coverage without the heat or bulk of a goggle. That makes sense for trail centres, woodland rides and faster eMTB loops where wind, mud, grit and branches can all become irritating quickly.

The coverage is especially useful when descending. You are not looking through a tiny lens or catching wind around the edges. The glasses feel protective and secure, which adds confidence when the trail narrows or the surface gets rough.

They also sit well with the kind of helmets most Electric MTB UK readers are likely to use. If you are pairing them with a trail lid such as the Smith Pilot Mips, the big-lens Smith eyewear style makes a lot of sense.

Comfort and fit

The Syncline was comfortable on the trail, with no obvious pinch points. The soft arms are a strong detail because they help the glasses sit securely without digging into the side of the head. That is important when worn under a helmet, where even a small pressure point can become annoying after half an hour.

The adjustable Megol nose pads and temples also help with fit. They give the glasses enough tuning to sit securely without sliding around, and the large shield design did not feel unstable despite the size.

The large fit is worth highlighting, though. These are not tiny glasses. Riders with smaller faces may find them too big, while riders who like a lot of coverage will probably love them. For MTB and eMTB use, I would rather have a slightly bigger lens than not enough protection.

Ventilation and trail use

Ventilation was good enough that the Syncline did not become distracting. The built-in venting and lens gap help keep the view clear, and the glasses did not feel overly closed in despite the large lens.

That is important because woodland riding often brings slow climbs, short sharp efforts and sudden descents. Glasses that fog quickly can ruin a ride, especially when you are moving between warm, sheltered trees and cooler open sections.

The Syncline feels well suited to real trail riding rather than just looking good in a product photo. It gives coverage, clarity and comfort without making the rider feel boxed in.

What is not so good?

The main caveat is lens choice in dense woodland. The ChromaPop lens was superb for trail detail, rocks and changing light, but very small branches could appear slightly late. If your local riding is mostly dark forest, the clear lens may be the better choice on some days.

The second issue is fit. Smith describes the Syncline as a large-fit sunglass, and that is accurate. The big lens gives excellent protection, but riders with smaller faces may want to try before buying.

The final point is that this is a proper performance riding glass, not a subtle casual pair. That is not really a criticism, but the size and shape are clearly MTB-focused.

Final verdict

The Smith Syncline sunglasses are excellent for trail and eMTB riding in changing woodland light. The ChromaPop lens gives superb clarity through dappled and low-level conditions, making rocks and trail detail easy to read. The only slight limitation is that tiny branches can appear a little late in busy woodland light, but the included clear lens gives you a proper backup for darker days.

Comfort is another strong point. The Syncline is big, protective and secure, but the soft arms and adjustable nose pads stop it feeling awkward. There were no obvious pinch points, and the large lens gives the kind of coverage that makes sense for proper mountain biking.

For riders who want eyewear that feels closer to a goggle than a small pair of cycling glasses, the Smith Syncline is easy to recommend. It is especially strong for trail centres, woodland riding, eMTB loops and mixed-light UK conditions.

Smith Syncline alternatives

Smith Syncline Sunglasses FAQs

Are the Smith Syncline sunglasses good for mountain biking?

Yes. The Smith Syncline sunglasses are well suited to mountain biking and eMTB riding thanks to their large coverage, secure fit, ChromaPop lens and built-in ventilation.

Are ChromaPop lenses good in woodland?

Yes. ChromaPop lenses are very good in woodland because they enhance contrast and help trail detail stand out. In very dark forest, the included clear lens may be the better option.

Do the Smith Syncline sunglasses come with a clear lens?

Yes. The Smith Syncline includes a bonus clear lens, which is useful for low-light rides, dark woodland and winter conditions.

Are the Smith Syncline sunglasses comfortable?

Yes. The Syncline felt comfortable on the trail, with soft arms, adjustable nose pads and no obvious pinch points. The large fit may not suit every face shape, though.

Who should buy the Smith Syncline sunglasses?

The Smith Syncline is best for MTB and eMTB riders who want big protective coverage, excellent lens clarity and strong performance in changing trail light. It suits woodland riding, trail centres and riders who prefer goggle-like coverage without wearing goggles.