<https://goodgear.gogoodguru.com/product/pain-free-posture-4-inch-foam-riser-4-inch-stadium-seat-sport-cushion-kneeling-support-yoga-exercises-egoscue-knee-back-pelvis-support-padded-cushion-waterproof-cover-with-foam-gardening-pad/#product>
<http://schema.org/description>
"Made with Waterproof 420 denier Polyester with PVC coating. All products come with foam filled polyurethane inside, density of 22KG/M3, ILD of 80.\r\nImported\r\nUser for EGOSCUE Method Exercises, Posture Therapy, Yoga, Pilates."
<https://goodgear.gogoodguru.com/product/pain-free-posture-4-inch-foam-riser-4-inch-stadium-seat-sport-cushion-kneeling-support-yoga-exercises-egoscue-knee-back-pelvis-support-padded-cushion-waterproof-cover-with-foam-gardening-pad/>