I bought these shoes to replace another pair of Hi-Tec that lasted almost 10 years (actually still wearable, but the top fabric is starting to wear out).  I usually wear a 7 1/2 or 8 medium and bought these in 8 M to be sure.  They are significantly narrower than my last pair...but since the old ones are thoroughly broken in (meaning they feel like old slippers) I think the new pair will be fine. The colour, Dark Chocolate, is really attractive; the shoes are very light weight and after only a couple weeks, the tightness has lessened significantly.  I would definitely buy them again.

Update: I initially gave these boots a great review, but after less than a year the soles started to separate on both shoes in multiple places. Now, reading other negative reviews, I see this sole separation is a common complaint. The "treads" seems to be thin pieces of hard foam that can simply peel off.  Otherwise the shoes are well made and very comfortable.  I've been using shoe glue to reattach the soles, but I wouldn't re-buy them and can't really recommend them.