Sweat-activating sportswear brand HEATTRAP has teamed up with the iconic fighting manga and anime series Hanma Baki (範馬刃牙) to release a limited-edition sauna shirt collection commemorating the franchise’s 35th anniversary. The items will go on sale via the official online store starting July 7, 2026.
About Hanma Baki
The Baki series is a martial arts manga by Keisuke Itagaki, serialized in Weekly Shōnen Champion (Akita Shoten). The story centers on Baki Hanma, the youngest champion of an underground fighting arena, and his all-out clash with his father Yujiro Hanma — known as “the strongest creature on Earth.” Hanma Baki is the third arc of the series, focusing entirely on the father-son showdown taken to its absolute limit.
The first anime season (12 episodes) premiered on Netflix in September 2021 and aired on television in January 2022. It depicted standout moments including Baki’s fight against a 100-kilogram mantis conjured from his own imagination, and his brutal battle with Biscuit Oliva inside the Black Pentagon prison.
The “Wearable Sauna” Collaboration
HEATTRAP has built its reputation as a “wearable sauna,” using fabric technology designed to maximize perspiration during workouts. For this collaboration, the brand fused the raw tension of key manga scenes with its own signature message — “Sweat!!!” — to create an exclusive piece unlike anything else in the lineup.
The collection is marketed under the tagline “Put it on and sweat like a waterfall — perspiration output: Ogre-level,” a nod to Yujiro’s overwhelming power. It is aimed at both dedicated Baki fans and anyone who enjoys training or sauna culture.
Product Details
- Designs: 3 front variations (all share the same back design featuring a striking “demon face” graphic)
- Price: ¥8,778 (tax included)
- Sizes: M / L / XL / 2XL
- Material: Polyester & Spandex
- On Sale: July 7, 2026 via the official online store
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