Under 99g! The World's Lightest-Class Business Polo Shirt Has Arrived! – A Savior for Summer Business with Amazing Lightness and Breathability

Haruyama Shoji Co., Ltd. (Headquarters: Okayama City, Okayama Prefecture; Chairman and President: Masashi Haruyama), a company dedicated to supporting the health and well-being of business professionals, will launch the 'i-Polo Ultra Lightweight Series' at all Haruyama stores nationwide starting Saturday, June 20, 2026. In recent years, Japan has faced increasingly severe heatwaves, making comfort in business attire an essential requirement. This product achieves an ultra-lightweight class of under 99g (L size)※1 while adopting a highly breathable fabric※3 that offers approximately 1.7 times the airflow※2 compared to standard products in the same category. Additionally, it features Wash & Wear (W&W) performance grade 5※5, equivalent to the i-Shirts series, which has surpassed cumulative sales of 11 million units※4. This means the shirt can be washed at night and worn again the next morning, powerfully supporting the daily lives of busy business professionals.

3D立体 Silhouette: Comfort Beyond Lightness

What sets this product apart from other polo shirts isn't just its lightness and breathability. Japanese people tend to have shoulders that tilt inward. To address this, the shirt adopts a forward-seamed 3D pattern tailored to the shape of Japanese shoulder blades, reducing the common issue of collar slippage backward (rear shift) during wear. The forward-set sleeve design minimizes fabric tension when moving the arms, delivering comfort that allows stress-free movement from desk work to field visits.

Furthermore, by refining the collar stand pattern, the shirt fits snugly around the neck, maintaining a clean silhouette with a crisp, upright collar. Combined with the smooth, silky texture unique to high-gauge 46-gauge fabric—known for its extremely fine knit—the shirt ensures all-day comfort, whether outdoors in extreme heat or in air-conditioned offices.

Since the day after the launch coincides with Father's Day, this shirt makes an ideal gift for fathers who work hard every day. Why not include the real benefits of 'lightweight, cool, and easy to move in' as a thoughtful present for someone special?

Product Overview

【Product Name】 i-Polo Ultra Lightweight Series

【Price】 5,690 yen (excluding tax)

【Sizes】 S, M, L, LL, 3L

【Colors】 Black, Navy

【Material】 100% Polyester

【Release Date】 Saturday, June 20, 2026

【Features】

• Ultra-lightweight design under 99g※1, among the lightest in the world

• Highly breathable fabric※3 offering approximately 1.7 times the airflow※2 compared to standard products in the same category

• 3D立体 pattern designed for shoulder blade movement, combining ease of movement with a sharp collar appearance

【Available Stores】 All Haruyama stores nationwide

※Some stores may not carry the product. Please contact your nearest store for availability.

【Inquiries】 Haruyama Customer Service Center: 0120-923-924

※1 Based on company research for L size

※2 Verified from fabric quality inspection report No. TO-2603500 by Tokyo Testing Center, Menken Quality Inspection Association, a general incorporated foundation

※3 Verified from fabric quality inspection report No. TO-2603201 by Tokyo Testing Center, Menken Quality Inspection Association, a general incorporated foundation

※4 Cumulative sales volume of the company's 'i-Shirts' series from April 1, 2009, to February 14, 2026. Based on company research

※5 Verified from fabric quality inspection report No. TO-2603748 by Tokyo Testing Center, Menken Quality Inspection Association, a general incorporated foundation