If it appears to be a fuzzy material or a woven fabric (usually white, but can also be gray, black, or brown), its vinyl. If it looks like suede, its probably leather. If you already own a leather/vinyl match, pay careful attention to your conditioning regimen.
The left kidney, small intestine and descending colon are all found at the lower left side of the back, also known as the left lumbar region.
Thee are two organs in the left lower back: a kidney is just under the bottom of the ribcage, and the descending colon (and in some people the sigmoid colon) are located in that area... These are really deep internally.