Lifefactory
A sincere "glass, not plastic" brand that gets the main event right — the bottle body is borosilicate glass in a protective silicone sleeve — but stops short at the closure. The cap, ring, and stopper are polypropylene, and on a baby bottle those parts sit directly in the milk path, so the product we list rates only minimal-contact. The glass-first intent is real, but plastic still touches what the baby drinks.
How clear are their specs?
Lifefactory is upfront that the body is borosilicate glass and the sleeve silicone, and it doesn't hide that the caps, rings, and stoppers are polypropylene. Materials are named rather than buried behind "BPA-free."
