Best overallFor wind-driven snow, when sunglasses stop working
Smith I/O MAG Goggles
The only thing that works in a whiteout on a pass, and the second lens covers flat light — for most teahouse trekkers this is an expensive item that never leaves the duffel.
Skip it ifAny standard teahouse trek. Take these for a peak climb or a winter crossing, and rent rather than buy if it is a one-off.

