Your 25oz Müv mugs, Nav tumblers, and Resa Straw Tumblers are equipped with a swappable silicone sleeve that protects from dents and dings. Snag another sleeve to make it uniquely yours. Step 1: Pick a Müv 25oz, Nav 25oz or Resa 25oz. Step 2: Choose an additional swappable sleeve. Step 3: Swap your sleeve to mix and match to your mood or your fit.