Climate-tech firm Eztia Materials has introduced a water-based gel technology designed to combat relentless humidity and heat stress. The company’s HydraVolt technology utilizes beads of water-based gel printed on the inside of garments to absorb body heat, which can potentially reduce skin temperature by as much as 9°C.
The solution was featured at the Building and Construction Authority’s technology exchange event on May 22. The event gathered government agencies, construction firms, and tech companies to investigate innovations, including wearables and artificial intelligence, to protect workers from rising heat.
How the Technology Functions
Unlike cooling suits that rely on batteries or fans, Eztia’s garments do not require charging. The cooling effect is achieved as the water in the gel beads slowly evaporates, making the skin feel cooler. This temperature reduction can be sustained for six to eight hours.
The current product line includes an inner-wear singlet, arm sleeves, a bandana, and a scarf-like wrap. To maintain the garments, they can simply be soaked in water or tossed into a washing machine once the gel begins to flatten after several hours of use. Each piece of garment is expected to last between three and six months before replacement is necessary.
The company offers various items, such as the singlet for US$57 (S$73), arm sleeves for US$37, and cooling bandanas for US$25. Eztia is currently testing the invention at several locations, including a pilot with PSA Singapore and a partnership with Expand Construction at the NS Square construction site in Marina Bay.
Field Testing and Safety Considerations
During the pilot at the NS Square site, which began in early 2025, workers reported an immediate cooling sensation and improved endurance during intense physical tasks. Assistant project director at Expand, Asher Lum, reported that a worker without the attire had a skin temperature of 34.8°C, while a worker wearing the Eztia garment recorded a temperature of 30.8°C at the same time, and location.
The current version of the technology was improved in 2025 following worker feedback. To address previous discomfort caused by hard, rubber-like beads, a softening agent was added to create a more jelly-like consistency.
Future Outlook
The cost of the cooling garments could potentially decrease over time through economies of scale if more worksites or defense personnel adopt the technology. Meanwhile, the Ministry of Manpower is looking into the possibility of using cooling vests for road marshals.
Frequently Asked Questions
- How long does the cooling effect last?
The temperature difference can be sustained for six to eight hours. - How can the garments be refueled or cleaned?
The garments can be reused by being soaked in water or tossed into a washing machine. - What is the expected lifespan of a garment?
Each piece of garment can last between three and six months.
Could wearable cooling technology become a standard safety requirement for outdoor labor?
