This kitchen knife is made from underwear

Kiwami Japan is the MacGyver of knife making. He's made knives out of the darndest things -- cardboard, gelatin... fish. But he's really outdone himself this time. He's crafted one out of men's boxers. Yes, a knife made from underwear. It's sharp too, it can cut raw chicken, office paper and cucumbers. What will he think of next?