i was just reading a review on these. they not only cool but dehumidify ,so even on cool days they will stop the fogging of sheild. and they are not much heavier than standard helmets. because of plugging into bikes electric,so no need for battery in helmet. but they said it does draw a lot, so you will need a beafy altenator. but they just came out so im sure they will get better with more options soon.