Your post reads like you work in marketing or consumer research function and have been tasked with getting people to talk about & ultimately switch to coverless duvets. Including a product link is a warning sign, it usually means you are tracking clicks. Just tell people what to google to find it.
Its impossible that washing & drying a duvet doesnt use more energy than washing and drying a thin cover.we are in an energy crisis, we should not be wasting energy on this and people don't need to piss money away buying more bedding they don't need.