From BruMate’s Website: The Müv 15oz was made for fueling your day and is the most feature-packed mug with a handle there is. It has our 100% leakproof BevLock™ lid to seal in your beverages and stop leaks, our brand-new, OctaLock™ thread system to make taking your lid on and off a breeze, and our MagFlip™ technology to assist in keeping your lid open while you sip. Also equipped with a scratch-resistant + comfort grip handle, and our BevGuard™ technology to keep your drinks hot for 4+ hours or cold for 24+ hours. Note: This print glows in the dark. It must be exposed to sunlight or lamp light to glow.