This article is from the Lure Coursing FAQ, by Bonnie Dalzell with numerous contributions by others.
What are lure coursing blankets?
Lure coursing blankets are the means by which the different hounds in
a course are identified by the judge. They are light in weight and
designed to be non-restrictive to the galloping hound. They should be
made of a double stretch material and you need one in each of these
* high recognition yellow (bright yellow or "green yellow")
* high recognition pink (hot pink).
* high recognition blue (eye shattering cyan).