Well, Shamu said it very nicely: Cool Water meets Irish Spring.
An endearingly modest fragrance from Caswell-Massey. The 1930s golfer on the box, the beautiful green-glass bottle and the printed claims of CM's ancient history lead you to think you're getting something very traditional. The presence of "ozone" and the fact that the frag is about one degree off from Cool Water dash that particular hope.
That said it's really quite a nice fragrance - I find it smoother and better-blended than the current hectic formulation of Cool Water, and it's quite inexpensive. A likeable cheapie. I don't know if I'll be buying a bottle, but I would take this over Cool Water any day.