The standard material is abs plastic and this comes in at 28 pounds. They have kept aerodynamics in mind, but it might not look as visually smooth when compared to Thule.
What makes it different than most cargo boxes? It is designed to be rear opening. This helps keep a tight seal away from where air is going. The front of the box that is facing the wind is always going to be secure, it is supposed to help(in theory) with aerodynamics.
This will mount to nearly all roof racks from the factory and roof rack bars, but if you want to be extra sure(which you should) then they have a fit guide.
It uses a U-Bolt mounting system, so as long as there is clearance over your roof rack and the U-Bolt, then it is compatible. They’ve listed this as “water-resistant” and not water proof.
Due to the mounting bracket holes they decided to give it that designation, but customers seem to have no issues with water getting in.
Something to note on this is that because it is rear opening, if you have an SUV check that you have a step on your bumper first. If not, it might be a bit annoying to reach.