OtterBox is one of those products that has a fairly niche appeal, at least for its original practically bomb-proof protective cases, but does its job so well that people keep coming back. The company has been making a mint off of its durable Defender series, and it hasn't wasted any time bringing out new versions for Google's Pixel and Pixel XL flagships.
The design consists of a two-piece hard shell with a permeant screen protector and foam lining, an outer soft shell to add impact protection, and an included belt clip for those who want to wear their phones like a Wall Street trader in 2003. Cutouts, ports, and extensions make all the buttons and sensors accessible (including a big sloping hole for the fingerprint sensor on the back), and the case is rated for protection against drops, scratches, and dust. It is not water-resistant, an important distinction since the Pixel phones aren't particularly water-resistant either, though I imagine the case will keep rain and sweat off well enough.
Like all Defender cases, these make your phone more or less an impenetrable brick: the Pixel case is 162x89x36mm and the XL version is 172x96x37mm. That's taller, wider, and three times as thick as the phones on their own. It's a small price to pay for peace of mind - but $49.95 or $59.95 for the Pixel and Pixel XL, respectively, is not.