Column

Can a black undershirt be worn under a white polo shirt?

Wearing a black undershirt beneath a white polo shirt is a common combination for both golf and workwear, but color bleeding is a frequent concern. I will present the test results as they are, alon...

"Quick-drying" by the numbers

There is no common standard for the term "quick-drying." That is why we provide the measured data exactly as it is.

I did not choose the highest-performance fabric.

The fabric used for CORE SHIELD® has the lowest near-infrared shielding rate among the four types developed. There is a specific reason why we chose that one.

The development of this fabric has been published in an academic journal.

The development of Trubeaute®, the fabric used in CORE SHIELD®, has been published as a research paper in the journal of the Japanese Society for Photomedicine and Photobiology. Here, we introduce ...

Why are UV-protection garments often black?

When looking for UV-protective clothing, you'll find nothing but black and dark blue. Why are the colors so dark, even though it's summer? There is a reason for this. And that reason comes with a s...

What does the UPF50+ rating measure?

When choosing UV-protective clothing, most people look for "UPF 50+." However, there aren't many places that explain exactly what range this number measures. I will discuss the ranges that UPF cove...

The Pitfalls of Autumn Golf: Even if it gets cooler, the sun is just as strong.

The weather has cooled down, so the sun must be weaker, right? Think again. In terms of classification, ultraviolet radiation in September is still just as "strong" as it is in August. A single rou...

What percentage of sunlight does sunscreen block?

"Sunscreen is designed to block approximately 5% of the sunlight that reaches the Earth's surface. SPF, PA, and UPF are all metrics for ultraviolet radiation, and there are no criteria for evaluati...

Revisiting Mandatory Heatstroke Prevention in the Workplace in Its Second Summer: Beyond Structural Improvements to "Equipment"

Workplace heatstroke casualties continue to rise. In this article, we will briefly outline the key points of the legal requirements, and then go "beyond" mere organizational preparation to explain ...

Why are summers in the city dangerous? Heatstroke prevention for urban heat islands and reflected heat

Summers in the city are qualitatively different from those in the suburbs. Furthermore, urban heat has a unique and troublesome aspect: "heat coming from below and from the sides" that cannot be fu...