Mammut Japan officially launched eYe JUNYA WATANABE MAN + Mammut for Fall/Winter 2026 on Friday, September 18 — a Japan-first retail window at Mammut stores (Shinjuku, KITTE Marunouchi, Kyoto, Shinsaibashi, Fukuoka Tenjin), Mammut’s official EC, eYe JUNYA WATANABE MAN shops, and select premium partners. Global release follows September 24, 2026. Official Mammut news and the PR Times release from Mammut Sports Group Japan set the dates and lineup.
The capsule is tight: six jackets and one backpack. Junya worked from Mammut’s alpine archive — Ventile® shells, goose down, and a headline Premiere Down piece in rare eider down — then pushed the cuts through eYe’s reconstruction language (patchwork insulation, refined outdoor silhouettes meant for city wear as much as mountain fantasy). Standout SKUs called out by Mammut include WR-J911 Ventile Jacket, WR-J913 Down Jacket, and the luxury-tier WR-J927 Premiere Down Jacket (¥605,000). The pack (WR-K291) closes the set with rope-inspired hardware and a climbing-carabiner Mammut mascot.
Mammut will also stage the collab inside Mammut Innovation 2026 at Mammut Shinjuku, October 1–4. Do not confuse this retail capsule with separate FW26 runway notes that borrow Mammut-adjacent outdoor cues — this is the signed eYe JUNYA WATANABE MAN + Mammut product drop.
Key details
Japan: Friday, September 18, 2026
Global: Wednesday, September 24, 2026
Lineup: 6 jackets + 1 backpack
JP price band (tax in): ¥81,400 (pack) – ¥605,000 (Premiere Down)
Showcase: Mammut Innovation 2026, Shinjuku, Oct 1–4
Source: Mammut Japan — eYe JUNYA WATANABE MAN + MAMMUT; Mammut Sports Group Japan press release (PR Times, Sep 18); product topic mammut.jp/topics.
Browse Junya Watanabe at Oneness. Exact Mammut collab SKUs are not in the Oneness catalog — Japan / global Mammut timing ≠ Oneness stock claim.