A practical way to tell a checked claim from a described one is to look for a named standard rather than an adjective. Organic, eco, and sustainable are all descriptions a brand chooses. GOTS certified, OEKO-TEX Standard 100, and GRS certified are all names of specific, checkable standards that somebody else had to confirm, and a product page that has earned one usually says so plainly rather than relying on a general word instead.
Applied to Nestoro's own range, this cuts both ways, which is the point. Most of the Best Years organic cotton soft toys in the soft toys collection are described as organic cotton and sustainably sourced, a genuine material claim, without naming a specific certifying body on the page itself. One goes further: the Organic Cotton Octopus Soft Toy's own product page states GOTS certified plainly, next to the same organic cotton wording used elsewhere in the range, the clearer version of the same underlying fact the rest of the range states more generally. Separately, the Wigiwama Beanbag Chair and Square Ottoman Set's Corduroy fabric carries a confirmed dual certification, OEKO-TEX Standard 100 and GRS (Global Recycled Standard), stated plainly on its own product page. GRS checks something different again: verified recycled content and a traceable chain of custody from waste material to finished fabric, rather than organic fibre origin. Three different claims, three different things being checked, worth reading as three separate questions rather than one interchangeable idea of sustainable.