I think this is the successor to the Sencha Green Mint that they no longer carry.
These are tea crystals, supposedly made in such a way as to give superior flavor, antioxidants, etc. You just mix them with water of your preferred temperature, although they do not recommend boiling.
The crystals did dissolve well, I’ll give them that. There were a few clumps, but those dissolved in mixed in fine after 2-3 minutes. I used cool water for an iced tea flavor.
It was OK. I think it does have a decent taste, although weak. It tastes like, well, spearmint and green tea. I wouldn’t buy it again, though I’ll probably finish the box. It might be nice to have one or two in my purse for times when I am out and want something other than water to drink.