Men's muscle shirt / tank top Cotton/poyester/spandex Machine wash YMLA style MB360 Cool comfort, hot looks. The YMLA Split Muscle Shirt for men is a unique cross between a tee and a tank top. Perfect for the gym, this men's muscle shirt from YMLA keeps your arms exposed for free movement while covering your chest and torso. Choose from two great color options in a cool burnout design: black and royal blue.