If I know I am going to use it in the morning I put it in the van while I drive to the lake. Warming the mask up helps to keep the mask from fogging on very cold mornings. I returned the first mask I had because of the fogging issue, and Save Phace was cool and sent me another mask to try and this one fogs up considerably less (it was a vented mask). I still have some fogging issues if I have to pull the cold mask out of my compartment and put it on to my warm face.