The Bell RS-1 - Well Ventilated Helmet
Off pops the clear visor and on snaps the smart Transitions alternative. This isn't an inexpensive option but it darkens in bright sun, clears up under cloud cover. Brilliantly functional, and worth every Baht of its 5,500 THB asking price, for it's a set-and-forget visor system, unlike the internal visor devices that you must lift and lower depending on the light. The Bell RS-1 without the Smart-Transition visor costs 13,900 THB what is not a bad price for what you get.
The other Bell RS-1 aspects we rate highly are noise suppression and comfort. The inbuilt padded wind collar reduces external noise, and the motorcycle helmet's shape minimizes buffeting and lift. The Contour Cut Cheekpads give a snug fit, so snug it makes fitting glasses a bit of a mission. However, this becomes easier as the helmet wears in.
A sensible aspect is the Magnefusion strap holder; rather than locking into place, which is a fumble with gloves on, the end of the chin strap magnetically locks onto the buckle to prevent it flapping around. The Bell RS-1 can be bought at a local dealer in Bangkok for around 13,900 THB with several colors and designs available.