Most listings offer two main cover styles: sewn (fixed) covers and zippered removable covers. Sewn covers are permanently attached, while zippered covers can be removed for cleaning or replacement.
Outdoor 22x22 cushions commonly list weather-resistant features such as fade resistance, water- or rain-resistance, UV resistance, quick-drying or all-weather construction, and mold resistance. Some listings also note specific water treatments (for example C0 water protection).
Many cushions include tie systems to secure them, for example four string ties, attached string ties, or dual/two-set tie systems designed to hold seat bottoms and backs in place.
Pack sizes vary widely: you’ll find single cushions, 2-packs, 4-packs, 6-piece sets, and 8-piece sets. Sizes depend on whether items are sold individually, as seat+back pairs, or as multi-seat bundles.
Thicknesses commonly range from about 4 inches up to 6 inches. Examples shown in listings include 4", 4.5", 5", 5.1", 5.5", 5.9", and 6".
Cover materials include 100% olefin, 100% polyester, 100% cotton, a 35% rayon/65% polyester plant-based blend, suede, and faux fur. Fill materials cited include 100% foam, 100% polyester/polyester fiber, high-resilience cotton, 4 lb high-density foam/sponge, 100% recycled polyester blowfill, and partially recycled polyester fiber.
Firmness and rebound are tied to fill type and density. Listings cite 28D high-density foam and 4 lb high-density foam/sponge for firmer, quick-rebound seats; high-resilience cotton or polyester sponge/fiber for a softer feel; and recycled polyester blowfill or partially recycled fiber for back loft and shape retention.