Brown fat is located centrally under the clavicular bones near the skin surface and can be measured with infrared thermography.

“so usually you cannot really see activation of your brown fat because it's located centrally in your around your central nervous system um and and the biggest Depot as you mentioned before is up here under the the cicular bones so um and very close to the skin surface and because it's so close to the skin surface I could measure it with this very expensive camera”