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Page 10 of 23 Yun et al. Soft Sci 2023;3:12 https://dx.doi.org/10.20517/ss.2023.04

Table 2. A summary of radiative cooler characteristics integrated into wearable devices
LWIR
Fabrication method Application method Breathability/Waterproof Thickness Solar reflectance Reference
emission
[117]
Deposition Coating X/O ~125 µm R : ~85% ε: ~80% Lee et al.
solar
[118]
Drop casting Lamination O/O ~100 µm R solar : ~90% ε: ~85% Xu et al.
Drop casting/spraying Lamination X/X ~500 µm R solar : ~95% ε: ~85% Kang et al. [42]
[43]
Drop casting/stack Encapsulation O/O ~700 µm R : ~99% ε: ~90% Byun et al.
solar

Figure 3. Passive radiative cooling materials and devices. (A) Colored passive radiative cooler (CPRC) integrated with wearable device;
(B) photographs of CPRC on flexible substrate with wearable device. Reproduced with permission [117] . Copyright 2018, Wiley-VCH
GmbH, Weinheim; (C) high versatile porous SEBS substrate for on-skin electronics; (D) spray-printed Ag nanowire electrodes for
on-skin electronics. Reproduced with permission [118] . Copyright 2019, National Academy of Science; (E) NFC-based patch-type tissue
oximeter (PTO) with nanovoid/microvoid polymer (NMVP); (F) optical image of device mounted on the forearm (G) temperature
[42]
comparison of black elastomer (BE), white elastomer (WE), and NMVP. Reproduced with permission . Copyright 2021, Wiley-VCH
GmbH, Weinheim; (H) conceptual illustration of gallium-based TES with multi-layered flexible and stretchable radiative cooler
(m-FSRC); (I) outdoor temperature test of gallium-based transformative substrates with and without m-FSRC under the sunlight.
[43]
Reproduced with permission . Copyright 2022, Wiley-VCH GmbH, Weinheim.

fabricated as five stacked single-layered FSRCs with porous structures, which lead to multiple Mie scattering
for outstanding reflectivity within the solar spectrum. Figure 3I verifies the cooling effect of a radiative
cooler for the transformative platform. The transformative platform with the integration of a radiative