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ONI Denim 544ZR-BKBK "Secret Black Denim" 20oz Stylish Tapered Jeans


There's no denying the range that blue jeans have. But the best black jeans for men can do just about anything blue jeans can do—and sometimes even better. The right pair of black jeans are the perfect foundation for building big fits. One of the most important types of denim in recent years has been Oni’s Secret Denim and it is now available in a double black version.

First launched in 2012, the Secret Denim has been one of the most desirable denim fabrics by Denim Heads around the world due to its unique texture and incredible softness and comfort. Only Oishi-San can produce this denim, and no one else can reproduce it. He uses extra-thick yarns of three different kinds of cotton woven at ultra-low tension on a vintage shuttle loom. The result is a beefier, extremely knotty unsanforized 20oz fabric with a fantastic slub, roughness and hairy texture.

The warp and weft use the same yarn as for the 20o indigo version, but they have been black sulfur-dyed for this version. Unfortunately, the owner of the workshop that makes the sulfur dyeing for ONI's heavy fabrics will retire soon and close the business, so this could be the last time we see a black Secret Denim.

The jeans are made with all the superior-quality ONI details such as black enamel coated steel buttons, high-quality pocket bags, heavy-duty bar tacks and a custom veg-tanned deerskin leather patch.

The cut is a stylish Tapered fit. A modern slim silhouette almost skinny with a strong taper and 32" inseam length.

*Please, keep in mind that, due to low tension, "Secret Denim" fabric will stretch quite a bit, so if your jeans are a tight fit at the start, don't worry because after just a few uses you will have gained the perfect fit.

The legend of ONI is alive to this day. In recent years Oishi-San has devoted himself to experimenting with widely varying grammages, rough textures, different indigo dyeing techniques and novelty cuts while always maintaining a very limited production and wielding his experience in denim which now goes back more than 60 years.

[Visit our LOOKBOOK and discover a great selection of heritage street-style outfits]

  • 20oz unsanforized black sulfur-dyed Japanese selvedge denim. It is a one-wash version so expect no shrinkage
  • 100% cotton
  • Medium rise
  • Stylish tapered
  • Heavy-duty bar tacks
  • Warp: black / Weft: black
  • Slubby, woolly and hairy texture
  • Ultra low-tension weave applied on the shuttle loom
  • Selvedge line colour: red
  • ONI custom black enamel coated steel buttons
  • Black powder coated copper rivets
  • Hidden rivet pockets
  • Peek-a-boo selvedge coin pocket
  • Durable cotton-lined fabric in front pockets
  • Raised belt loops
  • Custom vegetable tanned deerskin leather patch with ONI logo
  • Super limited quantities
  • Made in Japan


FREE SHIPPING on orders over €100.

€6 shipping cost on orders under the value mentioned above.

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European Union

FREE SHIPPING on orders over €150.

€14 shipping cost on orders under the value mentioned above.

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Rest of the World

FREE SHIPPING on orders over €250 (or the equivalent in your currency).

€25 shipping cost on orders under the value mentioned above.

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If for some reason you are not happy with your purchase you can return it to us within 14 days for a free size exchange or refund.

For more info please visit our returns or size exchange pages.