This is an unworn button down polo from Horze that features two patches (at the breast and on a sleeve) and an embroidered "Z" logo on the other sleeve.  The fabric is a white, textured moisture wicking design.  It is tagged as "COOL Std Competition Shirt LS."

The shirt is tagged as a size 6 and some measurements follow to help with fit.

armpit to armpit laid flat is 16 inches
the sleeve underarm seam is 18.5 inches
the back length is 25 inches

The shirt has its original tags and is in very good condition.  Its original price was $52.