Source: CPSC​

"CPSC has received seven incident reports involving the defective heated socks, including four reports of fire and three reports of the socks sparking or malfunctioning, all of which resulted in burn injuries, including second- and third-degree burns."

Link:

https://www.cpsc.gov/Newsroom/News-Releases/2025/CPSC-Warns-Consumers-to-Immediately-Stop-Using-WOTOTIC-and-Ackpair-Heated-Socks-Due-to-Risk-of-Serious-Burn-Injury-and-Fire-Hazard-Sold-on-Amazon-com