threeseason

Threeseason refers to a classification used primarily in consumer products to indicate suitability for three seasons: spring, summer, and autumn. It is generally contrasted with four-season or all-season to denote year-round use or harsher conditions. The term is commonly found in marketing labels, product descriptions, and industry discussions, and may appear as three-season, 3-season, or threeseason depending on branding.

In outdoor gear, threeseason items include tents rated for three-season use, sleeping bags with temperatures appropriate for mild to cool conditions, and jackets designed to protect against rain, wind, and chill but not extreme winter cold. In bicycles, a three-season model emphasizes comfort and versatility for variable weather. In architecture, a threeseason porch or sunroom is designed for use in milder months, often with screens or light insulation.

Etymology and usage notes: the compound is not standardized; usage varies by region and industry. In formal writing, three-season or three season may be preferred. The form threeseason is more common in branding, product names, and informal text.

See also: four-season, all-season, seasonality.