The first bracelet that heats or cools you. Wristify is developed by a team of MIT-trained engineers who are using cutting-edge technology to revolutionize temperature. Thermal relief. Anytime, anywhere. Wristify recreates the relief you get when you warm your hands by the fireplace in the winter, or when you refresh with an ice cube on your skin in the summer. Studies show that local warmth or cold gives you a body-wide sensation of thermal comfort. This is exactly what happens when you dip your toes in the cold water on a hot sunny day at the beach, or when you place a warm washcloth on your forehead on a cold evening.