iSaddle&reg; Anti-Fog Inserts Reusable Moisture Removing NoFog with Humidity Indicator for All Cameras GoPro Hero 1/2/3/3+/4 (12Pcs/Set) Drop inserts into sides of camera housing to prevent fogging in cold and humid environments. It assures you to capture precious moments by minimizing and even preventing fog condensation when diving, hiking, surfing, etc. Each insert lasts for approximately 4 uses Includes (12) Twelve Anti-Fog Inserts + Humidity Indicator Works with all GoPro Cameras.