The 901V2 is Belleville’s Jungle Boot, called the “Burma.” The V2 is because it’s their second version, with a thinner midsole than the first version.
As you can see, it features a Panama II outsole. Inside, there’s a puncture resistant textile insole and medial and lateral side drainage perforations. The vamp construction acts as a screen for sand and debris.
There’s also a removable PU footbed which provides some shock absorption and sits the sole just a bit off of the puncture proof insole which might have a bit of water which hasn’t drained. This helps keep your feet drier.