TPU, vinyl, cotton, bamboo, wool and the layers that determine how a protector performs.
Start with the buying framework, then move to product research only when it fits your intent.
How to chooseTPU—thermoplastic polyurethane—is a flexible polymer commonly used as the thin liquid-blocking layer in waterproof mattress protectors. The textile you feel and the membrane doing the waterproofing are usually different layers.
Both TPU and vinyl can be used to make a liquid barrier, but shoppers often compare them for flexibility, feel, material preferences and care. The better choice depends on the entire protector, not the membrane acronym alone.
A waterproof protector typically combines a fabric sleep-facing layer with a thin continuous barrier designed to stop liquid from reaching the mattress.
Waterproof and water-resistant are not interchangeable promises. A waterproof protector is intended to block liquid penetration under its stated use conditions; water-resistant materials are designed to resist or slow wetting without necessarily creating a complete barrier.
Organic cotton describes the fiber and textile certification story, not the entire performance of a protector. Fit, waterproof barrier, fabric weight and care still determine how the product behaves on the bed.
GOTS is a recognized textile standard covering organic fibers plus environmental, human-rights and processing requirements across the certified supply chain.
Compare the actual textile composition, knit or weave, waterproof layer and certification rather than relying on plant-source shorthand. “Bamboo” bedding is often sold as regenerated cellulose fabrics, while cotton is used directly as a natural fiber.
Wool and waterproof membrane protectors solve overlapping but different problems. Wool can provide absorbency, cushioning and moisture buffering; a waterproof membrane is designed to stop liquid passage.