Wearable devices plays a major role in uplifting the life quality of bed ridden patients. It is becoming a favorite comrade of health conscious people also. Several sensors are used for monitoring the various biological signals of patients suffering from illness like neurological disorders, physiological limitations etc. In this paper sensors, which forms the heart of wearable devices are reviewed. It also discusses the challenges in wearable technology.

Keywords : Wearable Devices,Sensors,Smart Clothing