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Work as expected
These have kept my feet warm down to 28 degrees. I chose these instead of socks because I was concerned about keeping socks from smelling with regular use.
Sizing was the biggest problem I had. Different charts have different sizes. In the end I settled on the large pair for my size 9 1/2's and they have worked. As others have said, if you can't pull out the insoles in your existing shoes then they are really tight, but that is as expected.
March 25, 2014
Great product, gets very warm. Worth the effort of wiring them up when you're going to be on the bike very long.
February 3, 2014
I am comparing these to the Gerbings heated insoles, which I also use. These have a less prounced and more natural feeling inside arch, which I like. However, the leads exit on the outer side, which I do not like. I actually use these in my ski boots (using the Gerbings battery packs), so I cannot comment on how they feel walking around in motorcycle boots, but I suspect that the leads might irritate. As a neutral observation, the rubber is firmer. The heat output is similar. Overall, given the much lesser price, I recommend these. If price is disregarded, then the Gerbings.
January 27, 2014
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Richard B:Yes. I've been researching this also and numerous sources I've found on the internet agree that all of these companies that use barrel connectors (TourMaster Synergy 2.0, Gerbing, First Gear, Sedici/CycleGear, etc.) all use 5.5x2.5x10mm (aka: Coax 2555) or what Radio Shack calls "size N". Wikipedia calls this the "most common coaxial power connector" in the article for Coaxial_power_connector. There is another connector with OD of 5.5 but an ID of 2.1 which some people have accidentally bought to make linkages. Those tend to be for lower current applications and are geometrically incompatible.Jan 23, 2014