What material are freezer labels made from, and can I write on them with a marker?

Freezer labels are built from durable synthetic film rather than plain paper, because paper fails in cold, damp conditions. A common choice is white BOPP with a laminate, which stays put through freezing and thawing.

• White BOPP with lamination: a plastic-like film that resists moisture and cold.
• Permanent freezer-grade adhesive: keeps the label bonded on chilled surfaces.
• Marker-friendly surface: the coated film accepts a permanent marker such as a Sharpie, so you can hand-write dates or contents after applying.

This makes freezer labels a good fit for frozen meat, prepped meals, and other items you need to date by hand. They are commonly produced in roll format for easy application. Test a marker on a sample first if smudge resistance is critical.