They are obligatory here on public transport (not that there’s much of that where I live). Big supermarkets don’t need them, but smaller stores can, if you can’t keep distance. But as I hate shopping I have had the need to at all so far. I hate crowded places anyway, virus or no virus. 😇 But if I needed to wear a mask/pull my Buff up, I guess I would, unless it was very hot.