After the snow finally melted in late May, I was able to put away my Shiver Mocs and use my new Barefoot Radius shoes. Right out of the box they were extremely comfortable with no break-in required. Having never used Barefoot shoes before, there was a short "get used to" period - not of discomfort, but of sore muscles in the feet from the different support these shoes provide. After a few days of use, I found them to be practically perfect. They are lightweight, snug (but not tight), and flexible. I have worn them virtually every day for the past month and they actually make walking more comfortable than any shoe I have owned. I look forward to trying other Barefoot shoes in the future.