Reticulated foam and polyester fiber are both excellent for outdoor furniture cushions. They are quick-drying and durable. Reticulated foam is slightly more expensive, but offers better microbial and moisture resistance, while polyester fiberfill is better suited to throw pillows as it has high-visual appeal but quickly compresses reducing support.
Dacron is another durable option and is exceptional for outdoor cushions as it does not flatten like other fill materials. Dacron cushions offer a more supportive and firmer seat, making them a great choice for patio sofas and loungers. The tight structure gives them a sleek, streamlined appearance ideal for modern and contemporary homes.
Also, consider the thickness of the seat cushion foam because this can impact the comfort of your furniture. Remember that the fill will compress when you are seated, so choose a cushion with a thickness of at least 4" deep. Padding should be around 2" thick for chaises and sun loungers. But remember, much thicker padding may not dry as quickly, potentially leading to mildew.