Autumn (seasonal) mugs are most often made from ceramic or dolomite, and some higher-end or finer styles are made from porcelain.
Autumn mugs are sold both as single items and as sets; several listings specifically offer either 1-piece or 4-piece sets.
Some seasonal listings describe large, soup-style autumn mugs that are roomy enough for soup, chili, noodles, or oversized hot drinks. These are typically around 20–24 ounces (many examples cite about 24 ounces).
Autumn mugs are commonly marketed for fall and harvest gatherings, Thanksgiving, Halloween, and other cozy-season occasions — they’re also popular as seasonal gifts.
Capacities vary from about 11 ounces up to 24 ounces; many seasonal mugs are around 16 ounces, while larger soup-style mugs often range from 20–24 ounces.
Many seasonal mugs measure about 4 inches tall and roughly 3.75–4.7 inches wide; larger soup or novelty mugs can be much bigger (examples around 7.0 inches high by 5.1 inches wide).