Not leather thickness. Not gauge of hide. Not suppleness or grain. Literally how much it weighs. Kilos or ounces. You decide. How heavy is your jacket? My "new" TT Leathers feels as light as a feather when it's on, and it weighs 1660g. That's 3.66lbs, or 58oz So it actually is as light as a feather. Over to you. e: because it appears I can't actually read scales.