My NIV soft cover Study Bible is 5.75" x 8.5", and this medium cover fits like a glove. The material, workmanship, and appearance are all first rate. I have no idea why the description says "economy". Prior to this cover I had bought a different one through eBay which was also for "medium" Bibles up to 6x9 inches, but it was totally huge and ugly, not like the eBay photos, and got returned. The Christianbook cover is better quality, perfect fit, and half the price.
This cover is nicer quality than other, more expensive ones that we own. It fits my son's bible perfectly and seems like it will last a long time. Would be absolutely perfect if it had a "belongs to" tag somewhere. The navy is quite dark (almost black in some lighting) so it will be hard to label.