Since I haven't really found much about the Herschel Supply Co. sleeves on their website or pretty much anywhere else online, I figured I'd take some detailed photos and give my insight on the sleeve. They are only available at Apple Stores and can not be purchased online. I'm a big fan of the aesthetic that Herschel brings to the table with their retro-modern design and was stoked to see that that the Apple Store carried their products.
There are 3 models available exclusive to the Apple Stores and come in three sizes starting with 11" for the MBA, 13" for MBA/cMBP/rMBP and 15" for the cMBP/rMBP. I decided to go with the 'Seymour' for my 13" rMBP. The packaging says that it is meant to fit the 13" MacBook Air and MacBook Pro models. It fits my rMBP perfect.
The outer has grain brown leather on the bottom with a white Herschel Supply Co. patch sewn on. The upper part of the sleeve is a black cordura material and seems very durable with a large black plastic zipper. The case is padded very well. The inside is lined with a black fleece material that feels almost like velvet... super soft. It has the signature white/red stripe lining near the sipper along with the 'Welcome To Herschel' tag that is seen on most of their products.
Overall it's a great sleeve. The retail price was $69.99 which seems a bit steep but when you actually check the product out and feel how well it's made with the attention to detail that the company is known for, the price is a no brainer.
Here are some pics: