Onsen Stack | No. 341Unisex T-Shirt

Structural Specifications: The Primary Canvas (Build 3001)

Description:The definitive baseline of the ichinichi catalog. Build 3001 is engineered as our primary structural canvas. Designed as an uncompromising, genderless silhouette, it delivers the exact balance of physical endurance and deliberate drape. It is not designed to be invisible; it is crafted to serve as the heavy, continuous foundation of the daily rotation.

The architecture of this garment demands absolute shape retention. Engineered with rigorous side-seamed execution and pre-calibrated for dimensional stability, it is built to maintain its stark geometry through continuous environmental cycles. The exterior plane is highly optimized to receive our visual discipline, ensuring every typographical and structural element binds permanently to the form.

Material Architecture: Solid artifacts are forged entirely from 100% Airlume combed, ring-spun cotton. The Ash variant introduces a highly deliberate 99/1 cotton-poly integration. Heather variants shift to a 52/48 ratio to achieve a specific visual frequency, while Athletic and Black Heathers utilize a 90/10 structural blend. The unique Heather Prism tones are calibrated at a 99/1 ratio. Every variant delivers a dense, premium finish.

Assembled across our global fabrication network under strict ethical and environmental protocols, ensuring every artifact meets the ichinichi standard before it is commissioned for your wardrobe.

Every ichinichi piece is made on demand, only after it is ordered. This keeps us out of the cycle of excess inventory and unnecessary waste.

Your garment is produced specifically for you, with a typical 3–4 day fabrication period before shipping. It is a slower, more deliberate model, but one that lets us make only what is needed and keep the process focused on quality rather than volume.

Nothing is pulled from a stockpile. Your piece is made for your daily rotation when you commission it.

ichinichi ships worldwide, with complimentary shipping on every order.

To reduce unnecessary transit and support our on-demand model, we work with a decentralized production network across the US, EU, UK, and Japan. Whenever possible, your piece is produced at the facility closest to your destination.

After a typical 2–5 day fabrication period, most orders arrive within 3–6 days, depending on region. Delivery times may vary internationally, but each order is routed through the nearest available production hub.