[U-DAY] Protecting the body from severe summer heat, launching high-performance all-weather umbrellas realized with RADICOOL, the world's first radiative cooling material.
Rain goods brand "U-DAY," operated by Because Co., Ltd., has released a high-performance all-weather umbrella featuring "RADICOOL," the world's first radiative cooling material. This product protects against harsh summer heat and utilizes an environmentally friendly, SDGs-compliant material.
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- 📰 Published: May 1, 2026 at 20:23
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Because Co., Ltd. (Headquarters: Setagaya-ku, Tokyo; President: Kazunori Watanabe) is expanding its rain goods brand "U-DAY" by launching all-weather umbrellas that incorporate "RADICOOL," the world's first radiative cooling material, building upon its conventional All Weather series. The lineup offers four items to suit various lifestyles: the larger Light, the compact Minimal, the wind-resistant Wind.R, and the automatic opening/closing Auto.
[Official Online Store]
[Rakuten Store]
[U-DAY Instagram]
[What is RADICOOL?]
RADICOOL is a "radiative cooling material" that suppresses heat accumulation on the umbrella surface, enhances reflectivity, and simultaneously radiates absorbed heat to the outside.
It holds the world's first patent and can lower the surface temperature of objects without using any electricity.
It works by suppressing heat from sunlight and utilizing a wavelength range called the "atmospheric window" that exists in the Earth's atmosphere to release heat as infrared radiation into outer space.
What makes it possible to use this material in umbrellas is the "HC series" fabric, which sandwiches a RADICOOL functional layer.
Features of RADICOOL, the world's first radiative cooling material, all-weather umbrella
Thermographic imaging results after 30 minutes showed a temperature rise reduction of approximately 40.7℃!
Thermographic images were taken of a mannequin's head after 30 minutes, with and without a RADICOOL parasol, under artificial solar illumination. The temperatures and temperature differences in the thermographic images are measurements taken under the following conditions:
(Measurement under specific environmental conditions)
Measurement environment: 25.0±1.0°C, Humidity 50±4%RH (Indoor testing)
Measurement sample: 100% Polyester RADICOOL white fabric (PU coated on the back)
Rib size: 55cm / 5-rib folding umbrella
Temperature changes were measured for 30 minutes, with and without a RADICOOL parasol, under artificial solar illumination.
Measurement position: 50cm from the thermal radiation receiver (temperature sensor) to the artificial solar illumination lamp.
Measurement environment: 25.0±2.0°C, Temperature 50±4%RH (Indoor testing) / Measurement sample: 100% Polyester / RADICOOL white fabric (PU coated on the back) / Rib size: 55cm / 5-rib folding umbrella
POINT 1
Heat shielding rate of 65% or more.
Uses the highest grade fabric to reduce heat transfer from sunlight.
POINT 2
100% UV cut rate
100% light blocking rate
Completely blocks both UV rays and light.
Furthermore, it achieves the highest UV protection factor, UPF-50+.
POINT 3
All-weather use, effectively blocking rain.
Excellent water resistance, can be used with confidence as a rain umbrella.
What U-DAY can do.
While general cooling technologies require electricity and emit carbon dioxide,
RADICOOL is an innovative, low-environmental-impact SDGs material that can provide cooling effects with zero energy.
It can play a significant role in reducing energy consumption, combating global warming, and preventing heatstroke, thereby realizing sustainable manufacturing.
Therefore, RADICOOL has been adopted for U-DAY's diverse all-weather series.
The models tailored to various lifestyles represent an innovative lineup of all-weather umbrellas for the next generation.
RADICOOL All Weather Light Mini
RADICOOL All Weather Light Minimal Mini
RADICOOL All Weather Wind.R Mini
RADICOOL All Weather Auto Mini
Because Co., Ltd. is a Tokyo-based rain goods brand.
Established in March 1994, Because Co., Ltd. launched its own brand "because."
The brand concept is "everyday life that can be enjoyed in any weather."
It proposes weather goods such as rain umbrellas, parasols, and raincoats that color a wonderful daily life, whether rainy or sunny.
It also operates a sustainable rain goods brand (U-DAY).
Official HP: https://www.because-jp.com/
Because Co., Ltd.
Location: 3-12-12 Soshigaya, Setagaya-ku, Tokyo
TEL: 03-5490-7186
Established: March 1994
Representative: Kazunori Watanabe
Business: Planning, manufacturing, wholesale, and retail of rain goods.
Keywords:
[Official Online Store]
[Rakuten Store]
[U-DAY Instagram]
[What is RADICOOL?]
RADICOOL is a "radiative cooling material" that suppresses heat accumulation on the umbrella surface, enhances reflectivity, and simultaneously radiates absorbed heat to the outside.
It holds the world's first patent and can lower the surface temperature of objects without using any electricity.
It works by suppressing heat from sunlight and utilizing a wavelength range called the "atmospheric window" that exists in the Earth's atmosphere to release heat as infrared radiation into outer space.
What makes it possible to use this material in umbrellas is the "HC series" fabric, which sandwiches a RADICOOL functional layer.
Features of RADICOOL, the world's first radiative cooling material, all-weather umbrella
Thermographic imaging results after 30 minutes showed a temperature rise reduction of approximately 40.7℃!
Thermographic images were taken of a mannequin's head after 30 minutes, with and without a RADICOOL parasol, under artificial solar illumination. The temperatures and temperature differences in the thermographic images are measurements taken under the following conditions:
(Measurement under specific environmental conditions)
Measurement environment: 25.0±1.0°C, Humidity 50±4%RH (Indoor testing)
Measurement sample: 100% Polyester RADICOOL white fabric (PU coated on the back)
Rib size: 55cm / 5-rib folding umbrella
Temperature changes were measured for 30 minutes, with and without a RADICOOL parasol, under artificial solar illumination.
Measurement position: 50cm from the thermal radiation receiver (temperature sensor) to the artificial solar illumination lamp.
Measurement environment: 25.0±2.0°C, Temperature 50±4%RH (Indoor testing) / Measurement sample: 100% Polyester / RADICOOL white fabric (PU coated on the back) / Rib size: 55cm / 5-rib folding umbrella
POINT 1
Heat shielding rate of 65% or more.
Uses the highest grade fabric to reduce heat transfer from sunlight.
POINT 2
100% UV cut rate
100% light blocking rate
Completely blocks both UV rays and light.
Furthermore, it achieves the highest UV protection factor, UPF-50+.
POINT 3
All-weather use, effectively blocking rain.
Excellent water resistance, can be used with confidence as a rain umbrella.
What U-DAY can do.
While general cooling technologies require electricity and emit carbon dioxide,
RADICOOL is an innovative, low-environmental-impact SDGs material that can provide cooling effects with zero energy.
It can play a significant role in reducing energy consumption, combating global warming, and preventing heatstroke, thereby realizing sustainable manufacturing.
Therefore, RADICOOL has been adopted for U-DAY's diverse all-weather series.
The models tailored to various lifestyles represent an innovative lineup of all-weather umbrellas for the next generation.
RADICOOL All Weather Light Mini
RADICOOL All Weather Light Minimal Mini
RADICOOL All Weather Wind.R Mini
RADICOOL All Weather Auto Mini
Because Co., Ltd. is a Tokyo-based rain goods brand.
Established in March 1994, Because Co., Ltd. launched its own brand "because."
The brand concept is "everyday life that can be enjoyed in any weather."
It proposes weather goods such as rain umbrellas, parasols, and raincoats that color a wonderful daily life, whether rainy or sunny.
It also operates a sustainable rain goods brand (U-DAY).
Official HP: https://www.because-jp.com/
Because Co., Ltd.
Location: 3-12-12 Soshigaya, Setagaya-ku, Tokyo
TEL: 03-5490-7186
Established: March 1994
Representative: Kazunori Watanabe
Business: Planning, manufacturing, wholesale, and retail of rain goods.
Keywords: