The GLB's wheelbase is 111.4 inches, making it 5.1 inches longer than the GLA and 1.7 inches shorter than the GLC. With a spacious cabin, the new Mercedes SUV can comfortably seat five people; the second row reclines, and if you need more room in the cargo area, it also can slide forward. A third row with two seats is optional, but it's short on head- and legroom and can only fit young children. The second row splits in a 40/20/40 configuration, the third row 40/60. Mercedes says families can install up to four child seats in the rear.

Design wise, the new GLB has a distinct look, with a boxier shape than its siblings. With short front and rear overhangs, it looks adventurous, and the front underride guard and raised beltline give it a robust stance. Because it has been designed for younger families, the GLB is available with cool details like an orange surround on the rims and black mirror caps, depending on the version you choose. The taillights are borrowed from the GLE and GLS, and the GLB's D-pillar is upright to provide a bit more headroom for those seated in the third row. Mercedes says the GLB was designed with an off-road character in mind.

Enter the cabin, and the first thing you notice is the MBUX infotainment system. The instrument panel is all digital with modern graphics. The rest of the interior has plenty of character. Beefy horizontal door handles and big circular air vents provide a distinct, rugged look, while the aluminum trim on the air vents, door handles, dash, and other surfaces offers a touch of refinement. It's a different take from what we've seen in other Mercedes vehicles, and the interior varies depending on the trim you choose. We prefer the brown and black leather with red stitching over the all-black interior, as it provides a lively atmosphere. And once the sun sets, you'll also enjoy the ambient lighting, with colors you can program to suit your mood. The ambient lighting has been expanded around the air vents, giving the cabin a young vibe.