The listings show a mix of materials: stainless steel, various plastics (including polypropylene), and silicone.
Most listings recommend use from 12 months and up; at least one listing notes suitability starting at 6 months.
Common accessories mentioned include straw-cleaning brushes, extra or travel lids, carabiner attachments, removable handles, and measuring marks on some cups.
Capacities in these listings range from about 9 fl oz up to 20 oz, with many options around 10 fl oz.
