To use, you shake the bottle to evenly mix the contents and then spray the super fine mist all over your face. I tend to do this in the morning after I wash my face but before my moisturizer or the same order before bed. The smell is reminiscent of mint and eucalyptus (to me anyway), though it's very light and you don't really notice it after it dries. It leaves my face feeling hydrated and my skin super soft. I swear it makes my skin appear/feel smoother, though I don't know which ingredient can claim this result. I like the 100mL size too, as it's convenient for travel (yes, I plan on taking this with me every time I travel--it's that great). I will repurchase as soon as my current bottle is empty.