The Go Pro Anti Fog Inserts prevents lens fog when shooting in cold & humid environments. These fog filters drop into your Go Pro housing for a fog free shooting experience. The inserts will last up to four uses. You can dry & reuse these inserts by heating them on a pan in oven at 300° F for five minutes. The inserts should be stored in an airtight bag for best usage. Capture those action-packed moments without compromising on scene quality with the Go Pro Anti Fog Inserts.