My daughter, who wears a 6 has plenty of room in a 5. She loves them. Very cozy and soft. I normally wear between a 9 and a 9.5 shoe, but I ordered the 8 because I read they will stretch and mold to your feet. I wear my pants over them and no one seems to really notice that I'm wearing boots all the time.
I've had both pairs for over 5 years now and have kept them looking and feeling new. The cost is worth it the quality is superior to anything out there! I received them within 4 days of placing the order with Standard Shipping. First to help with Real vs. Fake Uggs....