Japan Blue Jeans J504 Loose Fit 12.5oz

The J504 Loose 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 lightweight 12.5oz Japanese selvedge denim made with African cotton, this model combines heritage authenticity, a relaxed loose silhouette, and a softer hand ideal for extended daily wear.

Features

• 100% African cotton / 12.5oz
• Japanese selvedge denim made with African cotton
• Sanforized / one wash
• Red selvedge ID
• Loose Fit
• Mid-to-high curved rise
• Ergonomic curved waistband (CIRCLE line)
• Wide and comfortable thigh
• Wide 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 J504 Loose Fit, Japan Blue Jeans offers a more relaxed interpretation of its CIRCLE line, combining ergonomic construction with Japanese selvedge denim woven from African cotton. Known for its soft and consistent fibre, this cotton produces a lightweight, breathable fabric that remains comfortable while developing a refined fade over time.

The 12.5oz fabric provides an ideal balance between lightness and structure. It offers enough stability to maintain a defined silhouette despite the generous volume of the fit, while remaining comfortable from the first wear thanks to its one wash treatment, which stabilizes the fabric and slightly softens its hand without removing its raw 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 Loose Fit, defined by a relaxed and roomy silhouette throughout the leg. It offers a wide thigh, a straight and spacious leg from top to hem, and a laid-back contemporary profile. Despite its volume, the construction remains balanced thanks to a structured rise, avoiding excessive bulk while maintaining excellent comfort and mobility.

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

• Loose Fit
• Mid-to-high curved rise
• Wide and comfortable thigh
• Wide straight leg
• Relaxed and contemporary silhouette
• Enhanced comfort thanks to the curved waistband
• Lightweight breathable denim ideal for daily wear
• We recommend taking your usual size

Why We Selected It

We selected the J504 Loose Fit for its modern approach to relaxed denim, combining maximum comfort with precise Japanese craftsmanship. Its African cotton selvedge denim at 12.5oz offers a light, soft, and breathable hand while still developing character over time. Combined with the ergonomic CIRCLE construction and a controlled loose silhouette, it is an ideal everyday option for comfort without compromise.