Giro Atmos (road), Giro Hex (mtb).
If you feel like being motivated to buy a helmet, click the links in my sig. Multiple skull fractures and a fractured vertebra, four days in the hospital, one month unable to stand without a walker (vertigo), six weeks in a back brace, two months out of work. Lucky I didn't suffer adema or end up paralyzed.
If you don't have one, just buy a damn lid, please.