A Form-Fitting Nylon/Spandex Tank With Built-In Shelf Bra And Antimicrobial Freshtek™Moisture-Wicking Wash. Crafted out of our premium nylon/spandex blend for the perfect amount of stretch, the Happenings Tank sports an everyday fit with stabilizing elastic neckline and built-in Power Mesh bra. This informed design also boasts our ultra-durable four-needle flatlock stitching and a secret message on the elastic band.