A sweatshirt is a loose, collarless, long-sleeved pullover or jacket made from thick, soft, absorbent fabric, typically cotton or fleece, designed for warmth and comfort during exercise or as casual loungewear, with modern variations including hoodies (with hoods) and quarter-zips, focusing on comfort, breathability, and casual style for various activities and climates. 

Key Characteristics

Material: Usually cotton, fleece, or blends (cotton/polyester/rayon) for softness and absorbency.

Design: Pullover style (crewneck) or with zippers (zip-up, quarter-zip), often featuring elastic cuffs and hem.

Features: Can include a hood (making it a hoodie), pockets, or thumbholes.

Purpose: Originally for athletics to induce sweat, now popular for casual wear, lounging, and layering.

Common Styles & Variations

Crewneck: A classic pullover with a round neckline, no hood or zipper.

Fabric & Feel

French Terry: Lightweight, loop-knit, breathable, great for warmer weather or layering.

Fleece: Brushed interior for maximum warmth, ideal for winter.

Tri-Blends: Soft, "buttery" feel, comfortable for all-day wear.