Organic Cotton Sateen Flat Sheet

The Organic Cotton Sateen Flat Sheet is 100% Egyptian cotton, woven in a sateen weave at 300 thread count and garment-washed in MATTEO's dye-house using non-toxic dyes. The garment-washing process is what sets this sheet apart: it removes the need for ironing while producing a fabric that grows softer with each wash rather than breaking down over time. Designed and manufactured by MATTEO in Los Angeles, it uses pure 60s yarn in both warp and weft for an even, balanced weave.

Thread count measures the density of the weave, counting each individual yarn per square inch, but it does not capture yarn softness, weave balance, or finishing quality. MATTEO's Organic Washed Sateen at 300 thread count uses long-staple Egyptian cotton and a garment-washing process that produces a softer, more durable sheet than many higher-count fabrics woven from shorter, coarser yarn. At MATTEO, we consider thread count one data point among many, not the defining measure of quality in luxury cotton bedding.

The Organic Cotton Sateen Flat Sheet is available in Twin (79 x 106 inches), Queen (100 x 111 inches), and King (118 x 111 inches). For a California King bed, we recommend the King flat sheet; for a Full bed, the Queen flat sheet is the right fit.

No. The garment-washing process was developed specifically so this sheet would not need ironing. At MATTEO, we prefer a lived-in look, and the Organic Washed Sateen holds that relaxed finish naturally after washing. If you prefer a crisper appearance, press the sheet while slightly damp on the Lightweight Cotton or Medium setting.

Separate light and dark colors before washing and use a lukewarm cycle with a gentle detergent and a cool rinse. Do not overload the machine, as this can stress the long cotton fibers. Tumble dry on low heat and remove the sheets promptly to reduce wrinkling; line drying gives the best results. For garment-dyed colors, avoid chlorine bleach, alpha hydroxy acids, and benzoyl peroxide, as these whitening agents degrade reactive dyes. Bleach is safe only on white cotton. Learn more about MATTEO's garment-dyeing process.

The sheet is woven from 100% Egyptian cotton and dyed using non-toxic dyes, with no harsh chemical finishes applied after washing. The garment-washing process removes residual surface stiffness, so the fabric is soft against the skin from the first use. For anyone sensitive to synthetic dyes or chemical fabric treatments, MATTEO's non-toxic dyeing process and organic cotton construction are worth considering when choosing luxury cotton bedding.

Standard sateen sheets are typically finished and sold without a post-weave washing treatment, which means they can feel stiff initially and may require several washes before softening. MATTEO's Organic Washed Sateen goes through a proprietary washing process in the MATTEO dye-house that pre-softens the fabric and sets the color, so the sheet arrives already broken in. The result is garment-washed linen-like ease in a cotton sateen, a fabric that continues to soften with use rather than degrading.

The Organic Cotton Sateen Flat Sheet is available in fifteen colors: White, Moon, Off White, Greige, Salt, Iris, Mica, Oat, Bay, Alpine, Coal, Fig, Bark, Night, and Smoke. Darker colorways include a contrasting white top stitch detail at the hem. Because garment-dyeing is an artisanal process rather than a mechanically precise one, MATTEO allows for a shade variation of plus or minus 10% between dye lots. Pieces ordered at different times may show a slight tonal difference, which is inherent to the garment-dyeing method.