Cover fabrics commonly include olefin, and some options use polyester or cotton for the removable covers.
Listings commonly cite waterproof or water‑resistant covers, stain resistance, and sun‑ or fade‑resistant materials. Several listings also recommend storing cushions away from rain to prolong life.
Yes — covers are closed with zippers and are described as detachable or removable zippered covers.
Most seat cushions are listed as 4" thick, while some listings offer a thicker 6" seat cushion option.
Some listings include rope belts designed to secure cushions in place; one description specifically notes a 5‑rope‑belt design to help prevent slipping.