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With all the same features as the Single Pane Lenses, our Thermal lens includes a dual layer to help reduce fogging. Lens fog is caused by air inside your mask being hotter than the air outside your mask. By adding a second lens layer, we create a buffer so the temperature around your lens is more even, there by reducing fogging and allowing you to play with clearer vision. Our thermal lenses also include an anti-fog coating to help further reduce fogging.