Thread count measures how many threads are woven into a square inch, and the industry has spent decades convincing people that bigger is better. It isn't.
Why high thread counts mislead
Above roughly 400, gains are marginal. Most counts over 600 are inflated by counting multi-ply yarn as multiple threads — a “1,000-count” sheet is often a 250-count sheet with creative math, and it sleeps hotter for the trouble.
What actually matters
Fiber length. Long-staple cotton (Egyptian, Pima, or good long-staple domestic) spins into stronger, smoother yarn than short-staple — which is why a 280-count long-staple percale outperforms a 700-count short-staple sheet on both feel and durability.
Weave structure. Percale is a tight one-over-one-under weave — crisp, matte, breathable, cool. Sateen floats more yarn on the surface — smooth, lustrous, warmer, drapier.
GSM, for linen. Ignore thread count entirely for linen and read grams per square meter; roughly 150–180 is the sweet spot.
See how the picks stack up in our Best Organic Cotton Sheet Sets 2026 guide.