Our Tan, Medium Brown and Dark Brown leathers are a firm 8-9 ounce full grain leather.  The leather is made for the equestrian market so it is treated to be UV resistant and water resistant, which means it can stand up to the weather and not fade or stain from sun and rain. The finish can be stripped off with chemical washes so do not wash the bike with the bags on the bike.Our Distressed Brown leather is a softer 7 ounce top grain leather. We use this on certain bags so they will have that old school floppy look. When we make our big premium bags out of this leather we do reinforce the bags with ABS plastic so they will hold their shape and stand up to the test of time.