I've seen questions asking when will Sonos market the Move in White. If I were you I wouldn't hold my breath waiting for that to happen

Products designed for outdoor use have one common enemy…the Sun. Specifically UV rays and heat both of which are equally bad news for electronics. Without getting overly technical anyone reading this should achieve a layman’s understanding.
Color has a lot to do with how well UV rays are rejected. White has the lowest UV ray rejection rating and Black has the highest UV ray rejection rating. That said we all know that for clothing white is better for keeping the body cool versus black which absorbs heat. The best color to wear in the summer for UV Ray rejection and low heat absorption is Blue. Click here for a 3rd party explanation.
So…what does this have to do with the Sonos Move? I doubt very seriously that Sonos would consider marketing the Move in blue. The actual color of the Move is not black nor is it gray. It’s an off-black or what I’d term a "Shadow Black".
I’d bet your next paycheck that the Sonos engineers chose the Move’s color not by accident. I’d venture to say that the color choice strikes an acceptable balance between good UV ray rejection and reduced heat absorption. Thereby making Shadow Black the perfect color for an indoor/outdoor speaker. Looks good indoors and travels well outdoors.
Of course I've been mistaken before and that could very well be the case now. So feel free to offer your take on this subject. Now I’ve got to go install my new Sonos Port

Cheers!