Somehow, I had missed earlier reviews and comments regarding sizing for the Powerline shoes. So, when I saw them on sale, I ordered my regular size (9.5). As others experienced, when they arrived and I tried them on, I was surprised and disappointed by how tight and painfully uncomfortable they were. I placed them side-by-side with other 9.5 shoes (mountain and road bike shoes from other brands, running shoes, boots, dress shoes, etc., etc.) and found that the Powerlines were much shorter from heel to toe than any of them. I thought that I had possibly received a miss-labeled pair. I called RC customer service and they were very helpful (though they didn't mention that others had had a similar experience). I asked if the shoes might just need a break-in period and would stretch a bit and become more comfortable. I was advised that due to the materials used, it was unlikely that they would stretch enough to become comfortable and that I could return them for a refund or exchange them for another size. Since I really liked the design and quality of the shoes, I chose to try a half size up and that did the trick for me. As another customer noted, they were way more comfortable right out of the box. For me, though, I think an ideal fit would be right in the middle between the 9.5 and 10 sizes because, as that same customer noted, these 10's feel like they may start to feel a bit "sloppy" after breaking them in. We'll see. That said, I think these are great shoes and I expect that I will get used to the way they feel and come to like them very much...and because of how well made they are, I'll enjoy them for a long time. (BTW, Ride Concepts made the exchange process very easy. The only downside was the time it took in transit...a week there and a week back...to get the other size.)
That said, these shoes are surprisingly lightweight but very sturdy and will, like quality hiking shoes, probably benefit from a break-in period to increase their comfort level.