If youâ€™re one of those people whose routine is to give maximum effort at whatever you do, this is your shirt. If youâ€™re also one of those people who think sleeves are for nerds, this shirt has to be in your wardrobe. Meet the Max Effort Sleeveless Top: The workout gear designed to take whatever you can throw at it. Made with moisture-wicking and anti-odor 100% polyester fabric, it features mesh side panels for breathability. From warmup to cooldown, the Max Effort will be there for you as you show no mercy to your WOD.