coordinate and cumulative adjectives
Two adjectives of equal rank versus two that form a unit with the noun.
Coordinate adjectives take a comma: a long, dull meeting. You can insert and or reverse them. Cumulative adjectives take no comma: an old oak table. Old modifies oak table. See also coordinate adjectives: commas between equal modifiers.
Examples
Usea sharp, cold wind
Usea sharp winter wind
Avoida sharp, winter wind