Pima cotton keeps you cooler over a full shift and holds its colour through repeated washing. The reason starts with the fibre itself, and with how it is ginned.
Standard upland cotton uses short, coarser fibres. Pima's are longer and finer, which means less bulk packed into the same yarn and more space for air to move through the weave rather than sit trapped against skin. That's the mechanism behind the cooling effect — not a coating, not a chemical, just fibre geometry doing its job.



