Japan Blue Jeans J304 Straight Fit 12.5oz

The J304 Straight Fit 12.5oz African Cotton 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 immediate everyday comfort.

Features

• 100% African cotton / 12.5oz
• Japanese selvedge denim made with African cotton
• Sanforized / one wash
• Red selvedge ID
• Straight Fit
• Mid-to-high curved rise
• Ergonomic curved waistband (CIRCLE line)
• Comfortable thigh
• Regular 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 J304 Straight Fit, Japan Blue Jeans offers a clean and balanced 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 lightweight and comfortable fabric that remains durable and capable of evolving beautifully over time.

The 12.5oz fabric sits in a lightweight category, making it ideal for everyday wear and warmer seasons. It offers an excellent balance between softness and structure, while its one wash treatment 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 Straight Fit, a timeless silhouette defined by a comfortable thigh and a consistent straight leg from hip to hem. It delivers a clean, versatile look suitable for a wide range of styles and body types, making it one of the most classic expressions of Japanese denim.

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

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

Why We Selected It

We selected the J304 Straight Fit for its simple and effective interpretation of the straight-leg jean, combining Japanese craftsmanship with modern comfort. Its African cotton selvedge denim at 12.5oz offers a light and pleasant hand, while the ergonomic CIRCLE construction significantly improves everyday wearability. Its timeless straight silhouette makes it an essential wardrobe staple built for long-term use.