Wine glasses are just that glass, not metal simply because wine tastes best out of a glass. The problem comes when you want to drink chilled wine at a BBQ, or a pool party. Metal stemless cups give the wine a metal taste. Comes along Asobu's Wine Glass and silver Insulated Sleeve it's lightweight, it's double-walled insulated, and it secures your stemless wine glass (the glass is included in the package). Created with a novel, innovative world wide pending patent technology that will keep your wine chilled with no sweat on the outer wall.