The Viper Men's O-ring Collar Sleeveless Black Vinyl PVC Shirt.  Zips up the back and has an O-ring detail at the collar.  You may require assistance in zipping this up unless you have been doing your yoga.  Size chart show unstretched measurement. Stretches about 2 inches for a snug fit.
-Made in China (because that's where the fabric comes from)
-Hand Wash Cold, Line Dry
-95% PVC 5% Spandex