Japanese YouTuber Sharpens Underwear Into a Knife That Can Cut Vegetables
![Japanese YouTuber Sharpens Underwear Into a Knife That Can Cut Vegetables](https://nextshark.b-cdn.net/wp-content/uploads/2018/08/Underwear-knife.jpg?width=1536&auto_optimize=medium&quality=85&blur=80)
![Japanese YouTuber Sharpens Underwear Into a Knife That Can Cut Vegetables](https://nextshark.b-cdn.net/wp-content/uploads/2018/08/Underwear-knife.jpg?width=1536&auto_optimize=medium&quality=85)
![Bryan Ke](https://nextshark.b-cdn.net/wp-content/uploads/2021/05/profile.jpg?width=128&auto_optimize=medium&quality=85)
By Bryan Ke
A Japanese YouTuber, who turns any unsharpened objects like pasta or dried fermented fish into knives, is now turning regular boxer briefs into a functioning knife that can cut through vegetables.
The video starts off with Attoteki Fushinsha no Kiwami showing the materials used for creating the knife: a couple of 100% cotton underwear and briefs made from 92% nylon and 8% polyurethane, SoraNews24 reported.
![](https://nextshark.b-cdn.net/wp-content/uploads/2018/08/Knife-1.jpg?width=1536&auto_optimize=medium&quality=85)
He then cut the five briefs into strips before pressing with a cast iron pan heated up to about 300 degrees Celsius (572 degrees Fahrenheit).
![](https://nextshark.b-cdn.net/wp-content/uploads/2018/08/Knife-2.jpg?width=1536&auto_optimize=medium&quality=85)
The nylon-polyurethane materials bind together after being heated, while the cotton remains pliable. He then folds these two types together and heats layer upon layer until it is thick and firm.
![](https://nextshark.b-cdn.net/wp-content/uploads/2018/08/Knife-3.jpg?width=1536&auto_optimize=medium&quality=85)
After hardening the underwear, the YouTuber then traces a knife on top of the hardened cloth.
![](https://nextshark.b-cdn.net/wp-content/uploads/2018/08/Knife-4.jpg?width=1536&auto_optimize=medium&quality=85)
He then cuts an outline of the knife off and polishes the sides.
![](https://nextshark.b-cdn.net/wp-content/uploads/2018/08/Knife-5.jpg?width=1536&auto_optimize=medium&quality=85)
The YouTuber uses sandpaper to make the blade smooth, and a whetstone to sharpen it.
![](https://nextshark.b-cdn.net/wp-content/uploads/2018/08/Knife-6.jpg?width=1536&auto_optimize=medium&quality=85)
The finished product looks surprisingly like a real knife.
![](https://nextshark.b-cdn.net/wp-content/uploads/2018/08/Knife-7.jpg?width=1536&auto_optimize=medium&quality=85)
The YouTuber puts the blade to the test by trying to cut several items including meat, paper, and a tough cucumber.
![](https://nextshark.b-cdn.net/wp-content/uploads/2018/08/Knife-8.jpg?width=1536&auto_optimize=medium&quality=85)
Images via YouTube / kiwami japan
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