Underwater Anti-Fog Inserts 30pcs for Waterproof Dive Housing Removing Blur Defogger Underwater Photography Accessories Ideal for GoPro Hero 13 11 10 9 8 7 6 5 4 3 DJI Action Waterproof Case

Nice

Used them in my divevolk housing, went really well

If you are looking for the inserts for the Insta360 X4 Underwater case, these will not fit in the slots on the sides. They are too short. While they might work if you just throw them in the case, it's recommended that the anti-fog inserts be placed in the slots provided, which are on each side the lens area. The advertisement here makes you think these will work with the Insta360 case in the correct manner but they don't. I have searched all over Amazon for the correct size and I can't find them here, I had to go to another company. The size needed for this case is 37.1x19x1.2 mm.

Worked alright. Didn t get any condensation problem while diving, although not really deep (15 meters). The only thing I regretted is that it comes packaged by 2 units at a time. So when you need one, you end up with another one that you can t use immediately and then absorbs ambiant humidity.