Product review (1 stars): not rubber and not kink proof.
I had high hopes for this product as a replacement for the more common gray corrugated type which accumulates gunk and begins to smell bad after a couple of years.  The Amazon description incorrectly states "black flexible plastic is made of molded rubber to prevent kinking".  The actual material is a semi rigid black plastic that arrived with two permanent kinks in it.  It is definitely not rubber and definitely not kink proof.
I was able to relieve the kinks enough by filling the hose with boiling water and using  couple of spring clamps to partially restore the shape of the hose, but once it was installed the kinks came right back plus an additional kink at the machine end where a tight bend is essential if the washer is to sit even 6 inches from the wall