[RC] adjustable helmets - Sonshine575What is the name of the helmets (and the cheapest place to buy one) that has an adjustable knob for the size of the helmet? I would like to wear a knit cap underneath in the winter and NOT in the summer and be able to adjust it with just the turn of a knob. I am looking for one that covers the base of my skull in the back and one that I can get a huge brim to block the sun.Thanks, Catherine
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