Friends,
I strongly warn you against the Northwave Flash/Raptor Arctic GTX winter cycling shoes. The design is wrong and sizes are wrong. Note: Flash are for road bikes and Raptor are for SPD/MTB.
The shoe has an internal Gore-tex membrane, which serves as a sock. First of all, the sock cuff is far too tight and you'll be fighting to both pull on and pull off the shoe. Secondly and it is even worse, the sizing is completely wrong. As I do not know the US or British shoe sizes, I will only talk the EU sizes:
I normally wear EU size 46. When I bought Raptors size 47, those were totally too small. I returned them and ordered Flashes EU size 49 (the maximum size produced). Before I tried the shoes, I compared them with my leather winter boots size 46. The size 49 NW Arctic GTX were shorter than my size 46 boots! Then I pulled NWs on with a lot of effort and my foot exactly fitted the shoe, no allowance. Even worse, the heel of the Arctic GTX strongly projects behind the shoe top, making pulling the shoe on and off even more awkward.
The Raptors have their soles well made for the winter. The Flashes have a carbon sole which is extremely slippery even at home. BEWARE.
So if you are tempted to get a pair of NW Arctic GTX, start with ordering shoes of 4 sizes larger than you normally wear... Otherwise the Northwave winter shoes are very warm, breathable, waterproof, windproof and frost-proof (down to -10 C/14 F). I'm gonna keep them but I am not quite satisfied with them.
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