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506ZR 20oz Secret Denim Tight Fit Straight

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Oni Denim

506ZR 20oz Secret Denim Tight Fit Straight

Item Information
Fabric Weight (ounce)0.9
Type of FabricUnsanforized denim
Type of CottonAmerican cotton
RoughnessVery rough
Shrinkage (%)9
Fading SpeedFast
Methods of DyeingRope dyeing with pure indigo
SilhouetteSlim tapered
RiseSemi low rise
ThighsSemi slim
This is Oni's new model, the ONI-506ZR! This model has been produced based on the previous 507ZR model but the thigh and knee have been made smaller by 3mm while the hem has been made smaller by 5mm. So, it becomes much tighter with stronger tapered cut. Although the silhouette is almost same as the 517 but with the adoption of secret denim, shrinkage becomes a little bigger. Although it depends on how it is washed and dried, compared to the 517 model it has been reduced by about half an inch.
Size Chart (One-wash)
Size Chart (Non-wash)

We are proud to offer free worldwide shipping for orders over ¥15000.

Normally it takes 2-3 days for an order to reach most East Asian countries and North America, and 3-4 days for other parts of the world, once the item is picked up by Fedex or EMS at our warehouse. If the order was placed over a weekend, it will be processed the next business day, so it may take 1-2 more days to reach you.

Note that some items need to reach our dispatch location from various places in Japan, which may add 2-3 days to the order processing time. We nonetheless strive to get your products to you as soon as possible, and most customers will receive in-stock items within one week. 

If your item doesn’t fit, if you simply don’t like it, if you want a different color, please use
After receiving your return request, we will arrange a pickup for your item, which will be cheaper than using a postal service with no discount.




  1. Step1: We will prepare shipping documents (Airway bill and Commercial Invoice) to you. Please print them out and sign all of them.
  2. Step2: Call Fedex and request for a pick-up.
  3. ( Find your FedEx Locations from the URL below)
  4. Step3: Fedex driver will come for the pick-up. Please hand him the return package as well as shipping documents(Airway bill x 1 copy and Commercial Invoice x 3 copies).
  5. Step4: Once return product reaches, we will inspect the condition of the product and make a refund via the payment method you used. 


Same as above. Please return the product and place a new order for the right size.

Return conditions:

  • - The item must be unworn, unsoaked and still have tags on it. Hemmed products cannot be returned even in brandnew condition.
  • - The item must be in the original packaging.
  • - Return request must be made within 7days after receiving the product.


For any questions, please send an email to with your full name and the order number.

Availability: Out of stock

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Customer Reviews

20 OZ PAJAMAS! Review by Gelano P.
This pair is fantastic to its smallest details especially if you are looking for a more modern fit. The loose weave gives the fabric otherworldly slubiness and nep. It is also quite easy to break in compared to other 20 oz denim. They honestly feel like heavyweight pajamas!

Denimio's service is always peak! The live support was helpful in choosing the correct size. I received my jeans just two days after it was dispatched. Even the Union Special hemming service is on point.

Highly recommended for seasoned denimheads and new entrants alike!
(Posted on 5/30/16)
Excellent fit and fabric, unique pair of jeans Review by Mike P.
I've had a few pairs of raws but my first time buying Japanese denim or unsanforized denim, and first time with Denimio. Based on my measurements they recommended the Oni 506ZRs and I couldn't be happier. A totally unique, very comfortable pair of jeans.

First thing you notice is the very uneven fabric. If you want a clean, sharp looking pair of jeans e.g. an Unbranded, Rag & Bone, Raleigh, these are not that. The fabric is bumpy and uneven with little bits of nep sticking out, giving it a soft carpet-like feel to it that I (and my gf) love to touch.

Regarding fit, I just followed the advice of Denimio as to what size to order. I had heard (and read in the comments above) that it shrinks a lot, but they recommended an unwashed size that was my TTS (I'm 33.5 inches, they recommended a size 32, which is exactly 33.5. They found a pair that's between 32 and 33, so probably 34 inches). In the end it really didn't shrink that much, maybe an inch, and then stretched out to a comfortable 33.5. So if you're unsure, ask Denimio and trust their advice.

Regarding weight, it's 20 oz but compared to my equally heavy pair of Unbranded 121s, it feels lighter and much more breathable, I can wear it in warm weather without sweating. The loose weave also makes this much more comfortable than any other heavyweight denim you're likely to find. Not starchy or crunchy at all, the fabric folds easily. Which may be bad for high contrast fades, but if that's your only goal, might as well get APCs. But for comfort, good fit and a unique fabric, it's well worth it. (Posted on 4/5/16)
GODLIKE TEXTURE Review by Benjamin
Note. This is not a jeans. It's something you've never ever seen before. It stretches a lot. I really do mean a lot. I took 15 minutes to wear it from the start and it stretches bigger than my waist now. The texture is just out of this world. Shipping is incredibly fast. 4 days to Singapore (Posted on 10/18/15)
Amazing Review by jesse a.
These are the best pair of jeans I own (Posted on 10/14/15)
Superb Quality and Value Review by MATTHEW L.
The fabric used to create these jeans is stunning! Slubby, hairy, thick denim that's soft to the touch, or at least less stiff than one might expect. Against my legs, these almost feel like thick flannel --- they're that comfortable! This fabric stretches considerably: after two warm/hot soaks, I experienced only an inch of shrinkage in the waist, which promptly stretched almost an inch past pre-soak measurements within a matter of days. Overall, I'm extremely satisfied with jeans, and believe them to be an incredible value! (Posted on 10/1/15)
Fantastic Quality and Value Review by MATTHEW
Astonishing. The quality of workmanship in these jeans is absolutely fantastic; the denim is as sturdy as it is beautiful, with heavy slubbing and a remarkable blue-green hue; the fit is a classic mid-rise. I am so impressed with these jeans! Seriously, a contender for best value in the specialty denim market. (Posted on 9/23/15)
Oh. Man. Review by Matthew C.
What a wonderful, slubby piece of work. (Posted on 9/14/15)
Great!! Review by DongJin S.
Good price and delivery. Cool jeans :) (Posted on 9/7/15)
Excellent Pair of Jeans Review by James
Do your research to make sure the jeans will fit you after soaking them and you will be happy. The waist stretched back out pretty easily, so keep that in mind as well. The fabric is crazy! It's extremely textured and rough feeling, and nothing like any other fabric I've ever seen or felt. Shipping was extremely fast as well. (Posted on 9/4/15)
Fantastic! Review by BumKyoo S.
Fantastic! Denims quality is best! And Chaming! (Posted on 9/3/15)

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