The fabric is the single biggest factor in how a sheet feels and performs, more than thread count, more than brand. Here is an honest comparison of the four materials you will encounter most often, so you can match the fiber to how you sleep.
Cotton is the default for good reason. Long-staple varieties like supima and Egyptian are breathable, durable, and forgiving in the wash. Percale-woven cotton sleeps crisp and cool; sateen-woven cotton sleeps soft and smooth. The main downside is that lower-grade short-staple cotton pills and wears quickly, so fiber quality matters more than the cotton label itself.
Linen is the textured, breathable choice. Made from flax, it is exceptionally airy, handles heat and humidity well, and develops a relaxed, lived-in softness over years of use. The trade-offs are a wrinkled, casual look that not everyone wants and a higher upfront price. Linen rewards patience: it can feel slightly rough at first and improves with every wash.
Bamboo viscose is the plush, silky option. It drapes beautifully, feels buttery from the first night, and regulates temperature steadily rather than running hot or cold. It tends to cost more and needs gentle washing to avoid wear, but for sleepers who prize softness above all, nothing else feels quite like it.
Eucalyptus lyocell is the cooling specialist. The fibers wick moisture quickly and feel cool to the touch, making it the standout for hot and sweaty sleepers. It has a soft, slightly slick drape and a lighter weight than cotton. Like bamboo, it asks for a gentle wash cycle and low heat to last.
If you want one recommendation: choose cotton for all-round dependability, lyocell for cooling, bamboo for softness, and linen for breathability with character. There is no universally best fabric, only the best one for your climate, your skin, and your tolerance for upkeep.