Most bed sheets are woven from cotton, linen, polyester microfiber, or bamboo-derived rayon, while blankets lean on cotton, wool, fleece, or down for warmth — and the fiber, not the thread count, decides how a bed sleeps.
For the full breakdown, see our best Bed Sheets and Blankets guide.
A fitted sheet that sleeps hot, a blanket that pills after three washes — both trace back to the fiber content, and the label tells you more than any marketing claim. The material decides breathability, warmth, durability, and price far more than weave or brand. Below is what each common fiber actually is, who it suits, and the one number most shoppers misread.
What Are the Most Common Sheet Materials?
Cotton, linen, microfiber, and bamboo-derived fabrics cover the vast majority of sheets sold in the US, and each trades breathability against softness, wrinkle resistance, and cost.
- Cotton — the most popular sheet fiber; breathable, versatile, and comfortable across climates. Long-staple varieties feel smoother and last longer.
- Linen — woven from flax; highly breathable and durable, and typically cooler than synthetics. It wrinkles, and that texture is part of the look.
- Microfiber — a tightly woven polyester-based fabric; soft, wrinkle-resistant, and inexpensive, but less breathable than cotton.
- Polyester — a synthetic often blended with cotton, since 100% polyester can feel rougher and trap heat.
- Bamboo-derived — usually rayon/viscose or lyocell made from bamboo or tree pulp. Marketed for cooling, but it is a manufactured cellulose textile, not raw bamboo fiber.
- Flannel — commonly cotton, brushed for loft; warm and best suited to cold-weather sleeping.
One caveat on thread count: common guidance puts cotton around 200–400 and linen around 80–140, but these are rules of thumb, not official standards. A lower-count linen can outperform a high-count microfiber.
What Are Blankets Typically Made From?
Blanket materials split into breathable natural fibers and warmer synthetics or fills, and the right pick depends on how warm you sleep and how much weight you want.
Cotton and linen blankets breathe well and suit year-round or layered use. Wool is warmer and regulates temperature but needs gentler care. Fleece and microfiber are common synthetic comfort picks — light, affordable, and easy to wash. Down offers the highest warmth-to-weight ratio of any fill, though it costs more and raises animal-origin and allergy concerns for some sleepers. Down alternative mimics down’s loft with synthetic fill, which makes it a friendlier choice for allergy-sensitive households. Sherpa and chenille round out the synthetics: sherpa for a plush, warm backing and chenille for a soft, decorative hand.
