Sometimes referred to as "blinkers", race hoods are generally used to restrict the horse's vision to some extent (depending on whether a full cup or half cup is used) in order to encourage them to focus on the race rather than what is going on around them.
The Zilco stretch race hoods are made from 4-way stretch spandex/elastane material. The hoods are fastened with clips under the neck, which include touch-tape straps for extra adjustment.
This model has full cups, which are stitched onto the hood.
Red with Black Cups & Trim