Lapstyle calls these "the all new, never seen before" laptop covers, and there's a good reason why they've never been seen before: they are the stupidest accessory ever. The last thing a laptop needs is a cover that makes it retain heat.
If you hate your laptop and it's completely insured, get yourself one of these. Unless you're planning some computing sessions at the North Pole, this is definitely one of the dumbest ways to spend $25 we've seen in a long, long time. This is a joke, right? – Charlie White