The disclosed invention incorporates sweat sensing devices into headgear so that accurate biofluid analyte measurements may be made during physical activity. As disclosed herein, a sweat sensing device may be incorporated into an inner surface or support structure of headgear, including hardhats, sports headgear, flight helmets, combat helmets, sweatbands, sports caps, visors, and masks. The device is further configured to recognize and alter operational states when the device is not in adequate skin contact for operation. Some embodiments are fully disposable, and other embodiments include a reusable component that may be integrated into, or attached to, the headgear.
