Thicknesses range from about 1.8 inches up to 7 inches. Many common seat and back cushions fall in the 3"–6" range, while some thicker back cushions are listed at about 7".
Closure types include sewn seams, zippers, and hook-and-loop (Velcro) fasteners. Some cushions have removable covers with smooth zippers, while others use sewn construction or strap-style hook-and-loop closures.
Products list a range of protective features such as waterproof or water-resistant surfaces, weather-resistant/all‑weather construction, fade-resistant and UV-resistant finishes, and treatments for stain resistance, mold resistance, and tear resistance on some items.
Fastening options include fabric or string ties, multiple straps or rope belts, hook-and-loop (Velcro) fastener straps, and zippered closures on removable covers.