The Northwave Flash road shoe with an insulating Thinsulate membrane has been designed to deliver comfort, warmth and functional performance in low temperatures. With thermal insulation and a snug fit the Northwave Flash winter road shoe not only keeps you warm and protected from the elements but is also a performance oriented shoe with a stiff sole to allow for excellent power transfer through your pedals. Breathable too, when temperatures do rise slightly you won't find yourself overheating.
• 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
• User-friendly SLW2 dial to adjust fit
• Integrated heel system ensures efficient heel retention
• Arctic GTX footbed with a four-layer aluminium and fleece construction delivers outstanding warmth and insulation
• 360° reflective inserts
DavidOverall, this shoe served my desired purpose, which was to keep my feet warm during 2 to 3 hour rides in the winter, mostly in dry, sunny conditions. I live in southwest Utah in the US, where we have relatively mild winters with high temperatures in the 40s and 50s, and the colder weather only lasts about 2 months. On the plus side, these shoes are lightweight and comfortable, except that they were tight around my ankles, which meant loosening the wire more than I cared to in order to avoid ankle pain. With the shoes loosened, there was virtually no lateral stiffness in the uppers. I usually wear a 45.5 but since no half sizes were available, I went up to a 46 to ensure room for winter socks. As a result, the shoes were a little large for me, and because the uppers are so soft, without any lateral stiffness, I had to loosen the clips on my pedals in order to get enough lateral torque to release the shoes. However, I was pleased that I had enough room to wear a base layer sock underneath a pair of DeFeet WoolieBoolies, with enough room remaining to wiggle my toes. I have worn these in temperatures as low as 35 degrees with light rain and they kept my feet fairly warm. I am 59 and I don't have the circulation in my feet that I used to, so my feet get cold on winter rides. A younger person could probably get by with thinner socks without any problem. These shoes definitely don't compare in quality to the Sidis that I wear the rest of the year, but they are good enough to get me through the short winters where I live. One caution on the sizing: go with your Euro size. When my shoes arrived, the box said my 46 Euros were 13 USA, but there is absolutely no way they were that big. I would guess the 46s were closer to 11 1/2 or 12 max in US sizing.
DenisFit well, fitted cleats & tried them on a 60 km spin (8 deg C) were very comfortable, feet very warm. Haven't had the cold weather to really test them but they will be a big improvement over my normal road shoes this winter. Usual fast service from Merlin at a very competitive price
NJ riderGreat winter shoes, not as bulky as boots and comfortable for 3-4 hr rides in damp conditions in the 30s (F) with summer socks. Could easily add thicker socks for colder temps.