Take your Alta tracker from day to night by adding it to this sleek stainless-steel wristband to instantly elevate your evening look. As it's more of a fashionable accessory rather than a sporty one it's important to note that the metal is neither sweat nor water resistant, so it's important to limit its contact with moisture to reduce tarnish and damage. This wristband is one size that fits small-medium (5.5-6.5 / 140-165mm). Here's a Size Guide Please note: This is just the strap, you'll need to buy the Fitbit Alta Wireless Activity and Sleep Tracking Smart Fitness Watch separately.