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2025.06.14

You Won't Want to Go Back to Any Other T-Shirt! Mizuno's "365 All-in One T-Shirt" Offers Year-Round Comfort

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Japan's renowned sports equipment manufacturer Mizuno has consistently released sportswear made from pioneering high-function materials. Surprisingly, however, the material that took center stage in developing their new T-shirt is the naturally derived "Merino wool".
Wool is often associated with fall and winter, but Merino wool is reputedly cool and remarkably comfortable even in summer.
Released in spring 2024 and immediately becoming a huge hit, the "365 All-In One T-Shirt Merino Wool" makes waves. The project manager now shares everything about its surprising performance and how it came to life.
PROFILE
Masanori Inoguchi
Masanori Inoguchi

Mizuno Corporation
Global Apparel Product Division
Global Planning & Design Department

Merino Wool Delivers Outstanding Performance Even in Summer

When it comes to contemporary T-shirts, cotton and polyester are the most common materials.
So why did "365 All-In One T-Shirt Merino Wool" opt for Merino wool?
"Merino wool comes from the Merino breed of sheep, and its fibers are finer and softer than those from other sheep breeds. Mizuno has long appreciated the functionality of Merino wool, which is often used as a base layer for mountain climbing", says Inoguchi.
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