This review may be premature because I've only had these boots one day.  I wear an 8 and bought a 7.5 and they're a perfect fit  I did wear a pair of crew socks. Not super thin but not thick either. However I'm sure that if i had to wear thicker warmer socks with these boots, they would still fit great.  The bottoms have a good thick grip on my wooden deck, my asphalt driveway, a concrete walkway I have in the back yard. I bought these because the entire back fence line in my yard has poison ivy growing and even though I'm working with some super duper weed killer to get rid of it, I know that that nasty oil from the poison ivy will probably be around forever.  Being severely allergic, these boots protect my feet and ankles from any contact with poison ivy brush or vines, etc.  Also, i recently had an old old wooden structure removed so just in case there is a rusty nail here or there, my feet are protected. So far so good.  And if they do get roughed up and ugly from use, I'm OK with that because they're only for yard work, not to make any fashion statements.