Instead of throwing away kneehighs or any other hosiery [even socks! :^/], save them for faster cooling on hot days.
Soak them in water, then put the drink inside the hosiery leg/foot. Place the whole thing inside the freezer for about 15 minutes. The water helps it to cool faster, and the hosiery helps the water to stay at the side of the drink.
Thank you for reading!