I now have two pairs, one in my normal size (8) which is VERY tight, and one a size larger.  I use the 8s in the summer with very thin socks and now the 9s in the winter.  They aren't built for winter necessarily but I find them to work well with winter socks (just not too thick given how small they run).  Why do I own two pairs?  Because I love these.  LOVE.  Light, sturdy, my feet never hurt even after a long day.  Highly recommend.  Worth the price.