I read almost every review before purchasing these fantastic boots. They are exactly what I hoped for. I purchased my exact size and they fit perfectly. I have larger calves for my size, so I am always a little hesitant in ordering taller boots. No worries, these tevas have plenty of room.  They have no insallation, they're stylish but not purchased for warm winter boots. These tevas are very well made and my docs now have a competitor in long lasting. I went with the standard shipping and received them much sooner than expected. However, I wasn't very happy they were just left on my porch. Over all I am super satisfied with my purchase.