Just got these socks recently for playing basketball and working out.  They are a bit on the tight side, but not enough to be a nuisance (at least not yet).  They stay up very well.  The material feels a bit thin, but this is actually a good thing for me as I believe the socks I used to wear for basketball, which are thicker and not as tight, were the main reason I was getting blisters on my toes.  So far, no blisters with these socks.  For the record my shoe size is 8.5-9.5 depending on the make.