Just a Lid
The entire premise is removing plastic from the one part you put your lips on - the lid. Their lid is 100% food-grade ceramic, marketed as microplastic-free, and it retrofits mugs whose stock lids are plastic. It is one of the only purchasable answers to the travel-mug lid problem.
How clear are their specs?
States 100% food-grade ceramic and microplastic-free, and lists a general fit range, but is vague on exact mug compatibility (fits many Yeti tumblers but not Stanley/MiiR per buyer reports) and does not detail any seal.
Lead testing disclosure
Site only states the lids are "100% food-grade ceramic" with no named lab, no test numbers, no cited standard, and no dedicated safety/testing page - a bare marketing claim rather than disclosure.
- manufacturer https://justalid.com product/marketing pages state "food-grade ceramic" with no supporting test data
