“Serious protection against heat stress begins here.”
“Bringing subzero comfort to extreme heat.”
A new alternative to air-conditioned workwear, usable even in dusty areas and explosion-proof sites.
What is the Sub-zero Vest?
Developed jointly by Sakura Seisakusho Co., Ltd. and Chikuma Co., Ltd., this innovative cooling workwear is designed for extreme heat environments.
By utilizing -79℃ dry ice, the vest delivers intensive cooling to key areas such as the underarms and neck—where blood vessels are concentrated—helping to prevent heatstroke even in conditions exceeding 40℃(104℉).
The cooling effect lasts for 2 to 3 hours, even under extreme heat.
Lightweight, safe, and designed for unrestricted movement, the Sub-zero Vest puts the comfort and safety of workers first.
Functions and Features
Bringing subzero comfort to extreme heat.
Serious protection against heat stress begins here. Even in environments exceeding 40℃(104℉)where conventional fan-equipped workwear loses its effectiveness—the Subzero Vest continues to deliver reliable cooling performance.
1.Effective Cooling Beyond 40℃(104℉)
Provides stable protection against heat stress, even under extreme heat where fan-based garments fail.
2.79℃ Dry Ice for Powerful Cooling
Targets key areas such as the underarms and neck, enabling efficient full-body cooldown.
3.Safe for Hazardous Work Environments
Can be worn in explosive or dusty areas where fan-equipped wear is unsafe—offering a new alternative in heat protection.
Product Lineup
1. Flame-Resistant Type
Made with 100% cotton flame-retardant fabric on the front.
Suitable for use near furnaces and areas with flying sparks.
The neck dry ice pocket can be attached or removed in adjustable positions.
| Size Range | FA(M/L/LL) | FB(3L/4L/5L) | FO(6L/7L) |
| Length | 36cm(14.2in) | 38cm(15.0in) | 40cm(15.7in) |
| Chest | up to 100cm (39.4in) | 106~112cm (41.7-44.1in) | 112~118cm
(44.1-46.5in) |
※Material: 100% cotton; mesh parts: 80% nylon, 20% polyurethane
※Washables at home (use a laundry net)
※Dry ice packs sold separately (recommended size available)
2. Holster Type
Equipped with storage pockets under the arms.
Features a cross-back structure with an adjustable strap, allowing for a one-size fit.
Designed to fit a wide range of body types and can be worn comfortably under workwear.
Applications
Manufacturing: Suppresses heat buildup in high-temperature processes and warehouse operations with powerful cooling.
Steel Industry: Provides long-lasting comfort even in extreme environments such as steelworks and blast furnaces.
Chemical & Materials: Safe design for explosive and dusty areas, keeping workers reliably cool.
Pharmaceutical & Food: Maintains hygiene while efficiently cooling workers on high-heat production lines.
Construction & Infrastructure: Significantly reduces heat-stress risk during outdoor summer construction work.
Events & Services: Delivers quick, comfortable cooling for outdoor events and temporary worksites.
Precautions for Use
The Subzero Vest uses extremely low-temperature dry ice to achieve strong cooling
performance.
Incorrect use may result in frostbite or oxygen deficiency. Please observe the following
instructions:
・Do not use inside a vehicle, as there is a risk of oxygen deficiency.
・Never wear the Subzero Vest directly on bare skin, T-shirts, or underwear, as there is
a risk of frostbite. Always wear it over workwear or other clothing.
・Do not wear the vest when your clothing is wet, such as during rainy weather.
Moisture can cause rapid skin cooling and increase the risk of frostbite.
・Discontinue use immediately if you experience redness, pain, or any abnormal skin
condition.
※Please strictly follow the above precautions. The manufacturer cannot be held
responsible for frostbite, oxygen deficiency, or other accidents resulting from failure to
follow these instructions.
Integration with Dry Ice Station
“Subzero Vest × Dry Ice Station” enables in-house cooling solutions for the worksite.
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Flame-Resistant Type
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Holster Type
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Powerful cooling with dry ice
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Product Introduction Movie
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