For a dual-layer case that fits the Moto G 2015 comfortably, TUDIA's Lucion Hybrid is a protective option that doesn't break the bank.
Since this case combines both TPU and polycarbonate materials, there's a difference in texture between the bumper and the frosted shell on the back. The TPU bumper features glossed accents on all 4 corners along with hexagonal shapes on both sides that add to the case's grip and slightly rugged appearance. The back shell isn't exactly clear, but is more of a semi-transparent plastic that allows you to barely make out the Moto G 2015's battery door when installed. There is a large cutout for the camera and flash, too.
The lip around the front keeps the display of the Moto G 2015 safe from rubbing on flat surfaces while faced down. The back shell is slightly thick, but the case as a whole doesn't feel very bulky. It's easy to slide in and out of pockets since the TPU and polycarbonate doesn't stick, and it doesn't pick up fingerprints very easy either. There's access to the charging and auxiliary ports at the top and bottom of the bumper which should be friendly with any cable in your arsenal. Installing the case around the Moto G 2015 is incredibly simple and is just as easy to remove when necessary.
Side buttons are raised on the bumper to allow a more comfortable press instead of leaving a cutout. For handling drops, this hybrid cover will certainly hold up to the challenge. The TUDIA Lucion Hybrid Case for Moto G 2015 comes in black, blue, and gray bumpers for just $9.90 on Amazon if you decide you like its fused dual-layer design.