What Is TPU in a Mattress Protector?

TPU—thermoplastic polyurethane—is a flexible polymer commonly used as a thin waterproof membrane behind fabric surfaces.

Why it appears in organic-cotton protectors

The cotton textile and waterproof membrane perform different jobs. Organic cotton can provide the fabric surface while TPU blocks liquid.

What to verify

Check the membrane material, which surfaces are waterproof, and the permitted drying temperature. A heat-sensitive membrane can determine care even when the surrounding fabric is cotton.