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Northwave Flash TH Winter Shoes



Great for keeping your toes warm, and with great amounts of adjustment, but a little flexible

At every product is thoroughly tested for as long as it takes to get a proper insight into how well it works. Our reviewers are experienced cyclists that we trust to be objective. While we strive to ensure that opinions expressed are backed up by facts, reviews are by their nature an informed opinion, not a definitive verdict. We don't intentionally try to break anything (except locks) but we do try to look for weak points in any design. The overall score is not just an average of the other scores: it reflects both a product's function and value – with value determined by how a product compares with items of similar spec, quality, and price.

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Keeping your extremities warm is a must for winter riding and these Northwave Flash TH winter shoes address the issues of chilly toes without the faff of layering up. A distinct lack of vents keeps the wind at bay, although if you're used to a stiff carbon sole on your summer shoes you may find these a little soft for performance riding.

  • Pros: Excellent insulation, roomy fit
  • Cons: Flexible sole

Northwave has been making their GTX winter boots for a good few years now and these Flash TH shoes are a less extreme version for those who don't necessarily need the full extreme weather protection.

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Keeping the icy cool wind out is the main objective here and they do that by removing any form of vent from the upper.

The shoe is designed to encase your foot, so instead of the usual two sections being pulled by the straps, laces or whatever together over a tongue, the Flash TH's wrap over each other before being held in position by a Boa style cable system.

Northwave Flash TH Black - toe.jpg

Cable-tightened systems like these are great for getting an even tension spread over the top of your foot so you can get a snug fit without pressure points or hot spots. They are quick and easy to adjust too.

Using Northwave's SLW2 ratchet system, you can have them done up in a matter of seconds just by turning the dial. Each increment of the ratchet pulls or releases 0.7mm of cable so you can ultra-fine-tune them to get that fit spot on.

Northwave Flash TH Black - ratchet.jpg

Undoing the shoe on the fly is a one-finger operation should you need a bit more movement just by pushing down on the silver lever above the dial. One click releases the ratchet one tooth and so on.

Straight out of the box things were a little tight when it came to the ratchet undoing itself and I had to give the dial a little nudge with a finger to get things moving, but after a bit of use things were soon working exactly as they should.

To remove the shoes at the end of the ride, literally pull the lever up while pulling your foot or the upper up and the cable spool spins freely.


Northwave is often quite roomy when it comes to sizing, so they can be a bit 'try before you buy' to get the perfect fit. I own some Northwave mountain bike shoes in a 44 which fit but are a little too snug for winter use; I can't get away with thicker socks, for instance.

In all other shoes I'm a 45, the size I'm testing here, and while the Flash THs felt a little big at first, they soon felt just right. Firstly when it comes to cold weather things like tight gloves or shoes make a real difference to blood flow, often leading to those vulnerable body parts becoming uncomfortably cold, so having some element of movement here is a big bonus. There is also room to wear thicker merino winter socks if the temperature really starts to drop below freezing.

Northwave Flash TH Black - heels.jpg

Slop at the heel isn't an issue at all thanks to a grippier Velcro-esque material being used. I've seen it on quite a few shoes but I'd love to see it on more as it really keeps things secure by keeping hold of your sock even when you are really pulling on the up stroke.

Uppers & inners

On the outside the upper's man-made material doesn't feel any thicker than any other shoe (other than those designed specifically for climbing) so you don't get any added bulk which is good: spinning heavy shoes around is something you don't want to be doing.

It's water repellent too, which keeps your feet dry from road spray if the road's already wet when you head out, but obviously if it is actually raining water still enters from your tights as it runs down into the shoe. Once the water is in there, it's staying in there for a while too, until it seeps out around the edge of the insole to escape through the vent/drainage holes in the sole.

Northwave Flash TH Black - sole toe.jpg

That Arctic insole is from Northwave's GTX boots and it is constructed from four layers of thin aluminium and fleece for insulation. It works very well indeed: it's comfortable and nothing is getting through it to chill those toes.

In fact the whole shoe is unbelievably warm. As soon as you start riding your feet don't just stay at the same temperature they actually get warmer. You'll have windchill whipping around other parts of your body as you pedal off into the winter murk, but your feet will feel like you've slipped on your favourite pair of slippers which just happen to have been sat there next to an open fire... mmmmmm.

With standard socks – of course – I've worn these shoes out when there has been ice on the cars and frost on the verge with no ill effects and as I said earlier you could slip some thicker socks on if the temperature drops further without restricting blood flow.

> Buyer's Guide: 12 of the best overshoes

Glowing reports so far then. And more, literally in fact, as the amount of reflectives on display here are perfect for those dark rides. Spinning shiny feet are great for catching a following driver's eye, so it's great to see the entire heel section being designed to bounce the light beams back.

The NW side logo has also been given the reflective treatment, along with other detailing on both sides of the shoe. Impressive indeed.

The sole is my only real criticism, especially at this price point. For a pair of shoes costing £139.99 I'd like to see a carbon fibre sole like you find on the £120 dhb Aerons.

Northwave Flash TH Black - instep.jpg

Here, I found the carbon-reinforced nylon sole on the flexible side, especially when you get out of the saddle or put the power down. And bear in mind Northwave has aimed these at winter training for those type of riders who, like myself, wear carbon-soled shoes throughout the rest of the year.

If you go out for an exceptionally spirited ride this flex can easily lead to hot spots around the cleat area, which is very uncomfortable. Keep things at a more moderate pace though, and I can live with them on rides of four to five hours.

On the whole I like the Flash THs. They are great at what they are designed for: keeping the elements out and making sure your feet remain warm.


Great for keeping your toes warm, and with great amounts of adjustment, but a little flexible

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Make and model: Northwave Flash TH Winter Shoes

Size tested: 45

Tell us what the product is for

Northwave says, "The Northwave Flash TH Winter Shoes are perfect for the road cyclist who wants to continue training through the winter. Thinsulate® lining keeps feet warm and the snug-fitting Biomap Aero Overlap construction reduces aerodynamic drag.

"The Northwave Flash TH Winter Shoes feature the Arctic GTX footbed with a four-layer aluminium and fleece construction works with the membrane to deliver outstanding warmth and insulation and the extra thermal protection on the toe means no more numb feet ruining your winter training. The NRG Air Carbon Reinforced sole with a stiffness index of 8.0 means you won't sacrifice performance for comfort."

Warm shoes for those chilly rides but could do with a little more stiffness in the soles.

Tell us some more about the technical aspects of the product?

Northwave lists:

NRG Air Carbon Reinforced sole with a stiffness index of 8.0

* Ultra-snug fitting upper with BioMap Aero Overlap construction reduces aerodynamic drag

* Thinsulate® 200g insulation for optimum insulation and warmth

* Extra thermal coating strategically placed on the toe

* Abrasion-resistant tip TPU reinforcements

* SLW2 dial: the only one with step-by-step and full release in a single button

* Integrated heel system containing directional fibre prevents any slipping

* The Arctic GTX footbed with a four-layer aluminium and fleece construction works with the membrane to deliver outstanding warmth and insulation

* 360° reflective inserts

Rate the product for quality of construction:
Rate the product for performance:
Rate the product for durability:
Rate the product for fit:
Rate the product for sizing:

Quite roomy for a size 45.

Rate the product for weight:
Rate the product for comfort:
Rate the product for value:

How easy is the product to care for? How did it respond to being washed?

A clean with a wet wipe keeps them clean.

Tell us how the product performed overall when used for its designed purpose

Great windproofing, making them ideal for cold rides.

Tell us what you particularly liked about the product

Great at keeping your feet warm.

Tell us what you particularly disliked about the product

I'd prefer a stiffer sole.

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

Warm shoes which allow you to ditch the overshoes in the cold, but if you are after a shoe to replicate your summer race models you might find these a bit flexible. A slightly stiffer sole and these would be an 8.

Overall rating: 7/10

About the tester

Age: 38  Height: 180cm  Weight: 76kg

I usually ride: This month's test bike  My best bike is: Kinesis Aithein

I've been riding for: 10-20 years  I ride: Every day  I would class myself as: Expert

I regularly do the following types of riding: time trialling, commuting, club rides, sportives, fixed/singlespeed

With 20 years of road cycling and over 150,000 miles in his legs it's safe to say Stu is happiest when on the bike whatever the weather. Since writing his first review for back in 2009 he has also had a career in engineering including 3D-CAD design and product development, so has a real passion for all of the latest technology coming through in the industry but is also a sucker for a classic steel frame, skinny tyres, rim brakes and a damn good paintjob.
His fascination with gravel bikes is getting out of control too!

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