I need warm socks for an arctic trip and these socks arrived today.  They're warm and cozy and these are rated for
-30 degrees.  The top of the socks is loose enough to not constrict and comfortable in boots.  However the size covers sizes 5-9 for women and they may not fit snug enough for my size 7 foot.  I was also alarmed to see the delievery date in my order confirmation was for AFTER my trip date and different from the expected delivery date at the time of my order.  I sent an email and the vendor made sure the socks arrived on time - very accommodating seller!