Excellent at what they do, no matter how red and tired your eyes are 1 - 2 drops will make your eyes feel fresh and indeed icy cold, keep in mind those are mid strength (there is cool and arctic) and will sting a little before you get used to them But the cold fresh sensation that follows is well worth the initial sting. They are more expensive than your regural off the shelf eye drops, but when you see the effects you'll know where that money went