I love these socks because they are low-cut and have a higher percentage of merino wool than others. These are very warm even in the cold and they don't get hot/sweaty/smelly like nylon or cotton socks. They usually don't smell after 3 uses if you air them out...but then after I recommend hand washing them or putting them in the washer on low and always let them air dry and never put them in the dryer. I wear a size 8.5 mens and I ordered the medium and they fit perfect. Not too snug,not too loose. I highly recommend these socks.