In my quest to find the best wool socks to keep my feet warm I ordered this item.  These socks are the thickest wool socks that I have found on Amazon.  They are 78% merino wool and the package states that they have an arctic rating of up to -25 degrees.  The only downside that I have noticed, is that they attract lint.  I wash them by hand and line dry.  But I use them as slippers to wear around the house and as booties to sleep in at night.

Like others have stated, I was originally sent socks that did not match the product description.  They had a lower wool blend (65%).  I contacted the vendor and within days was sent the correct socks.