Siren care is a smart textile start-up founded in 2015 and based in California. It has developed a smart sock with embedded temperature sensor to help identify circulation problems in diabetics which, if left unchecked, can lead to serious complications such as amputation.
This is a large market in the millions. To support the companies growth they have raised $9 million round B funding to add to their initial funding of $12 million. Full details are in the link below.