It's half milk and half cream, so heavier than milk, but lighter than cream. It's the "Goldilocks" dairy product...not too light, not to heavy, it's juuuuust right.
From Wikipedia:
"Half and half" or "Half-and-half" is a mixture of milk and
cream, which is often used in coffee. In the United States, half and half is a common liquid product produced by dairy companies in premixed form. It was invented by William A. Boutwell of Boutwell Dairy in
Lake Worth Beach, Florida, which distributed the blend regionally between 1927 and 1956.
[14][15][16]
In the United States, half-and-half must contain between 10.5 and 18 percent milkfat.
[17] It is pasteurized or ultra-pasteurized, and may be homogenized."