Extreme climate conditions impact many different blue-collar industries, from construction to fire service. FLUX is designed to 1) provide a versatile way for blue-collar industry workers to easily regulate their body temperatures while working in harsh, variable climates, and 2) create a system for blue-collar industry employers to efficiently monitor and document workers’ body temperatures to ensure workplace safety. It consists of its wearable device (and additional modular units) and a paired mobile app that the wearable connects to via Bluetooth. Workers can attach FLUX to any item of clothing, as it has a simple Velcro backing, and control the amount of surface area it covers by connecting additional FLUX units. Thus, FLUX can be integrated into jackets, gloves, and even hard-hat liners!