The Kydex sheaths were custom molded to slide over your replacement blade & knife blade to keep it from cutting unwanted surfaces and do protect the blade it self.
All our Sheaths weigh next to nothing. The Ibex Mini and the Capra Hunter Ti sheaths weigh in at 0.3 ounces. The Fleshing pro and Tur Sheaths weigh 0.6 ounces.