Seem thick enough to last a little while, but not so thick that it causes problems in my running or training shoes.  I cannot comment on the durability of this product because I just received them.  Hoping they outlast some of my other more expensive socks.  If they don't, I will make a point to come back and update my review.

For now, I give them 4-stars.  That's Amazon's way of saying "I like it".  Can't say I love them, but I do like them... especially at the $12 for 6 pair of socks price point, whereas other name brands are almost double the price.