Japan Blue Jeans J404 Classic Straight Fit 12.5oz

The J404 Classic Straight Fit 12.5oz from Japan Blue Jeans belongs to the CIRCLE line, a collection designed to offer a more ergonomic approach to Japanese denim, thanks in particular to a curved waistband construction that provides improved support and enhanced everyday comfort. Crafted from a lighter 12.5oz Japanese selvedge denim made with African cotton, this model combines heritage authenticity, a timeless straight silhouette, and everyday comfort.

Features

• 100% African cotton / 12.5oz
• Japanese selvedge denim made with African cotton
• Sanforized / one wash
• Red selvedge ID
• Classic Straight Fit
• Mid-to-high curved rise
• Ergonomic curved waistband (CIRCLE line)
• Comfortable thigh
• Straight leg
• Natural leather patch
• YKK zip fly
• Copper button and rivets
• Chain-stitched hems
• Inner leg seam with signature blue stitching
• Made in Japan (Kojima, Okayama)

Description

With the J404 Classic Straight Fit, Japan Blue Jeans offers a lightweight and timeless straight-leg interpretation within its CIRCLE line, combining ergonomic construction with Japanese selvedge denim woven from African cotton. Known for its smooth and consistent fibre, this cotton produces a fabric that is soft, breathable, and comfortable from the very first wear.

The 12.5oz fabric sits in a lightweight category, making it ideal for daily wear. It provides enough structure to maintain a clean silhouette while remaining soft and comfortable thanks to its one wash treatment, which stabilizes the fabric and slightly softens its hand without removing its raw denim character.

A defining feature of the CIRCLE line is its curved waistband, designed to naturally follow the shape of the hips. This construction helps eliminate gaps at the back of the waist and significantly improves comfort when sitting, while also providing better overall stability. It is a core element of Japan Blue’s ergonomic approach in this collection.

The model features a Classic Straight Fit, a timeless straight-leg silhouette defined by a comfortable thigh and a consistent straight line from hip to hem. It offers a clean, versatile look that works across styles and seasons, making it one of the most essential expressions of the Japan Blue lineup.

Finishing details reflect the attention to craftsmanship: red selvedge ID, copper rivets and button, YKK zip fly, reinforced stitching, and signature blue inner leg stitching. Each element is designed to balance durability, functionality, and understated aesthetics.

Made in Kojima, Japan, this model perfectly embodies Japan Blue Jeans’ philosophy: offering authentic, durable, and modern denim designed for everyday wear while developing strong character over time.

Fit & Sizing

• Classic Straight Fit
• Mid-to-high curved rise
• Comfortable thigh
• Straight leg from hip to hem
• Timeless and versatile silhouette
• Enhanced comfort thanks to the curved waistband
• Lighter 12.5oz denim ideal for daily wear
• We recommend taking your usual size

Why We Selected It

We selected the J404 Classic Straight Fit for its perfect balance between timeless simplicity and modern comfort. Its African cotton selvedge denim at 12.5oz offers a soft, breathable hand ideal for everyday use. Combined with the ergonomic CIRCLE construction and a versatile straight silhouette, it is an ideal everyday denim choice with no compromise on quality.