The leather is high quality, the stitching is strong, and the wool felt liner on the inside keeps a grip on your MacBook without scratching it.
I’m a sucker for nice leather, especially for my Apple devices. There’s a company called Woolnut making nice MacBook sleeves. I haven’t tested them yet, but Jeff Gamet and I have a couple of them on the way, and I’m looking forward to it. They make different sleeves for MacBook, MacBook Air, and MacBook Pro (including with Touch Bar), starting at €68 (US$78). Sleeves are made from full-grain, vegetable-tanned leather, and the interior of the sleeve is wool. They also make leather wallet cases for iPhone.