You can not learn this until 370 skill. From 350 to 370 the only craftable with Borean Leather is Borean Armor Kit.
very good source of infinite dust/lesser cosmic essence/small dream shards.
the materials is also very cheap. just get a friend that is leatherworker to craft a bunch for you. then go nuts dissenchanting=)
Something that hasn't been mentioned yet, the top half of the "cuff" part of these boots appears to be glitched, as that section of the boots will take on the same texture as whatever pants you happen to be wearing (assuming your pants reach that low)
i don't know if this is a glitch or what, but i have found this to be quite handy for transmog, since i really like the "cuffed boots" look, and these boots can basically be made to match perfectly with any pants you have on since it seems to just mirror the texture that would normally be underneath it (if wearing short pants or no pants, for instance, the top half of these boots will be "flesh-toned")
the bottom part of the boots will retain the brown/white coloration but this seems to be a neutral-enough color and it blends well with many of my transmog sets due to this weird property
These appear to be the only boots sharing this model to have a "cuff" portion that folds back down over the top of the boots. All the others simply end flat against the legs (but the texture is clearly the same). Actually, the others are quite thick at the top, which makes me wonder if the cuff is actually some glitch in the model where the top polygons extend outward from the top of the boot instead of inward to meet up with the lower boots. In any case, a slightly different look for those interested.