Lens cases can be on the expensive side but I am happy that K&F is introducing a much more affordable option that also offers great protection. The interior is most likely closed cell foam like most others, but it is quite thick too; the amount of protection it offers is excellent and will be stiffer (keeps its shape) than most. The downside is that you do feel a bit more the edges of the padding where it is "unprotected", but there is almost no chance that anything can actually impact right through those small seams that it is a non-issue in my opinion. Note that these seams are a little wider than the big name brand lens cases, but neither are free of such gaps in protection and at the very least the stiffness of this case will prevent these gaps in padding to cause any real world issues.

It comes with good attachment options, and the zipper is nice to use, and I like how it is water resistant.

The only downsides, aside from the potential thickness/bulk related one, is actually the lid. While padded, it is a little hard to keep it flipped up/open. This does offer added benefit in terms of protecting the lens in case of a fall while the case is unzipped, but it is a bit more hands-on (two handed) than most when it comes to putting lenses away, for better or for worse. I do think this is a small price to pay for a well protected and well priced lens case, but it certainly is a little less convenient to handle.

Overall, a great option for lens protection if you don't mind the bulk, or if you just want extra protection.