Gopro hero3 anti fog inserts drop inserts into sides of camera housing to prevent fogging in cold and humid environments to reuse inserts will last for approximately 4 uses to dry out and reuse heat inserts on a pan in oven at 300 f for 5 minutes store in an airtight bag for use with all cameras gopro hero3 anti fog inserts features includes 12 anti fog inserts buy gopro hero3 anti fog inserts from chain reaction cycles the worlds largest online bicycle store