# Apparel Cooling Technologies

Topic radar · 4,692 documents · 2021-01-01–2026-10-31 · updated 2026-09-21

Canonical: https://slate.greyb.com/radar/apparel-cooling-technologies/innovations

## In one minute

### Five areas describe who wears the garment, and one stack of technology runs through all of them
The field splits into Everyday Comfort, Protective Occupational, Cooling Mechanism, Sports Outdoor and Medical Therapy. Those names mark the wearer and the occasion: ordinary clothing, sealed workwear, the hardware itself, sport, and clinical treatment. The engineering repeats across them. A fan vest belongs to Everyday Comfort and to Protective Occupational. A phase-change pack belongs to Cooling Mechanism and to Medical Therapy. A vented trouser and a vented sleeve are the same construction applied at different body sites [1].

That structure explains the shape of the evidence. This is one technology stack sold into five pockets of demand; the areas are demand, not physics.

The stack is narrow. Almost every document is one of five routes: move air with a fan, a duct or a vent; move liquid through tubing or bonded film; carry cold mass as ice, gel or phase-change material; cool electrically with a Peltier chip or a small compressor; or use a material that radiates, reflects or evaporates. A review of the field sorts the routes this way and treats the hybrids as the interesting cases [2] [3].

1. [CN224192993U](/?paper=CN224192993U&utm_source=radar&utm_medium=dashboard)
2. [10.1016/j.nxmate.2025.100762](https://doi.org/10.1016/j.nxmate.2025.100762)
3. [10.1051/e3sconf.202132703003](https://doi.org/10.1051/e3sconf.202132703003)

### Retail is selling passive cooling while the patents sit on powered systems
Four products define what a buyer can actually purchase in 2026, and none of them needs a compressor or a thermoelectric stack. A CO₂ cartridge jacket launched in September 2026 for urban heat. Water-based gel beads printed on the inside of clothing were shown to Singapore construction agencies in May and claimed a 9 °C surface reduction. Soaked evaporative workwear has been in daily use by Qatari crews since at least 2023. Fan garments crossed from building sites into office shirts and onto a Paris runway in June.


### Filing stopped falling in 2026, and every area is now publishing at or above last year's rate
Patents in this field ran 1,037 in 2021, 1,030 in 2022, 819 in 2023, 648 in 2024, 506 in 2025 and 462 through 21 September 2026. That works out at about 53 a month this year against 42 in 2025, so a four-year decline has levelled off at roughly half its 2021 volume.


### The claimed invention has moved to the joint between the cold and the skin
A fan, a pump, a thermoelectric module and a compressor arrive as bought parts with datasheets. Little in the record tries to invent them. What gets claimed is the interface: where the cold face presses, how the air gap stays open, how the circuit is sealed, how the module comes off before the wash.


### The buyer is an employer, and the price is set per shift
Every deployment named in the coverage is an organisation protecting a crew. 98 Fahren's cooling jackets are worn by police and gig workers through Indian summers above 45 °C. Eztia's gel fabric is being tested by Yamato delivery fleets in Hokkaido, Kajima construction sites in Tokyo, and a professional baseball club. Techniche's soaked uniforms are bought for Qatari construction.


### The 2021 peak was employers building their own kit, and the demand behind it has fallen away
Protective Occupational is where the decline is concentrated, and its filer list says why. State Grid holds 41 documents, Guangdong Power Grid 13, the PLA General Hospital 17 with a further 10 under a variant name, the affiliated hospitals of two medical universities 7 each. The organisations doing the filing are the organisations whose crews wear the suits. A grid operator that needs a cooler garment for live-line work patents its own design, and a provincial power bureau now files compressor refrigeration built for its own workers.


### A detachable module is the most repeated answer in the field
Independent filers converge on the same solution: make the cooling assembly separable so the garment launders and the hardware survives. A fan and battery on a zippered sub-panel, a fan plate fixed to a mounting opening, a resin receiver that a Peltier unit clips into in place of screw rings that vibrate loose, a replaceable cooling pouch at armpit height, and a set of detachable cooling pads inside a suit.


### The marketed number is an order of magnitude larger than the measured one
Every performance figure attached to a product is a company claim. The independent measurements cluster far below them.


## Overview


A field of several thousand patent publications, a handful of papers and almost no measurement. That shape makes cooling apparel a manufacturing and filing phenomenon before it is a validated product category, and the gap between the two is the point.


## Research

### Small compressors are challenging the thermoelectric chip, and the chip camp is answering with stored cold
The most consequential shift in the filings dates from mid-2026. Envicool filed a family built on compression refrigeration, with parallel evaporators serving separate cooling chambers and an evaporator module that draws hot air in and returns cold air. Ningbo University of Technology puts a micro compressor and condenser at the waist and a micro evaporator at the upper back, aiming at 24 to 26 °C and 40 to 60% relative humidity. A wearable backpack version circulates refrigerant through tubes in the clothing.


### The passive routes hold the science and the manufacturing risk
The papers cluster on materials: radiative fabrics, phase-change fibres, knitted spacers. The physics there is published and reproducible. Sweat, colour, laundering and dispersion at industrial scale are where these routes have to prove themselves, which makes them a fibre-and-finishing business, a different factory, a different regulator and a different margin from the connector-and-battery work in the powered branch.


### Two numbers carry the measured case, and their sizes disagree
The strongest whole-garment result in the record is a liquid cooling vest tested with a progressive heat-stress protocol. It raised the operative temperature at which a working body still held thermal balance from 37.9 °C to 41.0 °C in 40% humidity, and from 31.5 °C to 34.9 °C at 80%, with a calculated cooling flux of 475 W/m².


### Nothing in the field ranks one garment against another
No study compares two cooling garments against each other. The evidence is laboratory chambers, sweating manikins and simulations, with a handful of small human studies and two meta-analyses that both call for head-to-head protocols. The manikin method that would let a buyer compare products already exists and was followed in at least one comparison here, which makes adoption rather than invention the missing step.


## Market

### Three standards are being written and they count different mechanisms
Germany's standards body opened a project in December 2024 on quantitatively measuring evaporative cooling from textile materials, and its scope explicitly excludes fabrics that cool by stimulating cold receptors without removing heat. China published a national standard on testing and evaluating moisture-absorbing and cooling properties, drafted under Anta Group's lead, aimed at the false claims that have accumulated in summer apparel.


### Clinical cooling is the only part of the field with a payer, and it prices by procedure
The contrast with apparel is stark and it is institutional rather than technical. Three Category I CPT codes for mechanical scalp cooling took effect on 1 January 2026, replacing the temporary Category III codes, with Medicare rates of 1,883.43 per treatment cycle for cap fitting and education, 55.80 per session for pre-cooling and $32.31 per unit for post-infusion cooling.


### The sizing estimates cannot be used for a decision
Four forecasts describe nominally similar markets at irreconcilable scales. Cooled apparel is put at about 1.8 billion in 2025 rising to 4.6 billion by 2034. Wearable cooling devices are put at $638.96 million by 2032 on 5.89% annual growth. Thermoelectric systems alone are put at 28% of a 784 million market in 2025, reaching 2.1 billion by 2033. Active cooling textiles, a broader category, are put at 3.1 billion in 2024 rising to 8.9 billion by 2032.


### Capital is moving to the material suppliers, and the brand keeps the shell
The money in the coverage follows the finish, the fibre and the machine rather than the label. Polygiene launched a moisture-activated composition that binds to textile fibres and claims a 2 to 3 °C fabric temperature drop, positioned for sportswear, everyday clothing, bedding and workwear. YiLab, the company behind LifeLabs, closed an oversubscribed pre-A round taking total funding past $10 million to build a laboratory and factory in Asia and scale thermoregulating fabrics. Eztia raised $4.35 million for a material integrated into someone else's garment.


## Strategy

### Refrigeration and appliance companies now hold the largest portfolios
Two corporate groups sit above everyone else, and neither sells clothing. Haier appears under two names, 97 documents and 76, for 173 between them. The Anhui Meibo related entities, an appliance group, a refrigeration equipment maker and two affiliated manufacturers, add to about 91. San-es holds 31, Libre 22, Guangdong Fuxin 15, Gree 11.


### Clothing brands stayed small and filed on fabric
The largest apparel portfolio in the record is Nike's 37 documents, about a fifth of Haier's. Then 361 Degrees with 18, Bosideng 16, Toray 10, Teijin 8. Makita's 10 and Sony's 7 are the only non-textile consumer names of any size. The specialist outdoor and denim brands appear once or twice each.


### The geography is Chinese in every area, and medicine is the one exception
China holds 3,434 of the 4,692 documents, then Japan 401, Korea 235, the United States 211 and international filings 105. The Japanese total is concentrated rather than broad: 207 of the 401 sit in Everyday Comfort and 142 in Cooling Mechanism, which is where the workwear suppliers and blower makers are.


### The science record moved into universities while industry stayed on the joint
Of the 115 papers, 64 sit in Cooling Mechanism, and that cluster's own yearly run is 3, 6, 6, 10, 22 and 17. Papers overall are holding at about three a month, roughly level with 2025.


### Trade coverage is the one record still accelerating, and its companies barely appear in the patents
News ran 2, 5, 5, 10, 18 and 35 by year, which is about four a month in 2026 against 1.5 last year.


## Areas

- Everyday Comfort · 1,413 documents
- Cooling Mechanism · 1,241 documents
- Protective Occupational · 1,216 documents
- Sports Outdoor · 294 documents
- Medical Therapy · 428 documents