The new Kiichi “Kido Muso” Tee was created in collaboration with metal icon Matthew “Kiichi Chaos” Heafy of Trivium and Ibaraki.
Halfsumo’s original and unmistakable Irezumi style artwork has been reproduced with precision with a soft, breathable print that wears naturally over time.
Printed on an athletic tee, made in the USA from 100% ringspun pre-shrunk cotton. This mid-weight athletic blank is crafted with lighter yarns and hand treaded for a worn-in, textured feel. Subtle imperfections are intentional—part of the fabric’s character.
Every line has been reproduced
If you usually wear a Medium, stick with a Medium :)

United States
- USPS Ground Advantage $11.10 (2 business days)
- UPS® Ground $12.67 (1 business day)
- USPS Priority Mail $15.03 (2 business days)
- Free shipping on orders over $125
United Kingdom
- USPS First Class Package International £28.00 (7 to 21 business days)
- DHL Express Worldwide £35.00 (2 to 3 business days)
- USPS Priority Mail International £61.00 (6 to 10 business days)
- USPS Priority Mail Express International £80.00 (3 to 5 business days)
Europe
- USPS First Class Package International €29.95 7 to 21 business days
- DHL Express Worldwide €40.95 2 to 3 business days
- USPS Priority Mail International €70.95 (6 to 10 business days)
- USPS Priority Mail Express International €88.95 (3 to 5 business days)
Returns
- 14 day return period on all goods, with an optional pre-paid return service
OUR DESIGN PROCESS
The Half Sumo design process begins with the simplest tool: a line on paper.
Before a dogi, rashguard, grappling short, T-shirt, hoodie, or accessory becomes part of a finished collection, it starts as hand-drawn artwork. For co-founder and designer Luigi Scarcella Perino, drawing has always been a natural form of expression. Half Sumo Collective grew from that instinct, shaped by childhood afternoons spent reading manga, years of martial arts training, and a visual world built from Japanese woodblock prints, ukiyo-e, irezumi-inspired tattoo art, graffiti, street art, and combat sports culture.