I cannot recommend this product more highly. The quality of the slippers is beyond doubt and the delivery has been the best that I have ever received from Amazon.
I was not asked to pay extra and the delivery was next day. Not only that, I received an E Mail from DMS telling me the delivery would be between 11:53 and 12:53. It arrived on the dot of 11:53.
I have given up on the Amazon "guaranteed next day delivery"(substantial extra charge), because they simply cannot control the process. Indeed, one recent product arrived at the delivery firm AFTER the "guaranteed" delivery time.
As I say, if you are in the market for quality slippers, this is the firm for you.