Co-design of smart sensors and integration into firefighters or dives PPEs includes the integration of different sensors containing microcontrollers, communication modules and adequate software applications for data processing to measure biomedical (pulse, temperature, pulse, oxygen level) or environmental parameters (oxygen level, depth, pressure, temperature, gas composition) to help workers in their activity and ensure that working conditions are safe. The integration of wearable smart sensors into textile products is mainly based on sensors' flexibility and miniaturization, while integrating some smart sensors for diving or fire protection consists of integrating some rigid components.