Under Armour Band The Under Armour band provides you with the tools to track your day, record your progress which will help you reach your goal. The band measures your sleeping patterns & your resting hear rate. The display will stay on during workout & thereÆs no need to push any buttons. Product Features Your UA band has the ability to measure sleep duration & quality, count your daily steps. The band is water resistant & can be won in the shower but should never be submerged in water. Your UA band is Bluetooth compatible. It has a snug comfortable fit., size ONE SIZE