Organic Cotton Sateen Flat Sheet

The Organic Cotton Sateen Flat Sheet is 100% Egyptian cotton in a sateen weave at 300 thread count, woven with pure 60's yarn. It is garment-washed at MATTEO's dye-house using a special washing process that produces a soft, lived-in feel from the first night. The organic cotton sateen provides a balance of softness and warmth without requiring ironing.

Yes. Thread count measures the density of the weave, not the softness of the underlying yarn or the balance of the construction. MATTEO's Organic Cotton Sateen at 300 thread count uses 60's yarn in an Egyptian cotton sateen weave, which produces a silky face and a fabric that grows noticeably softer with repeated washing. Higher thread counts can actually create stiffer, denser fabric that does not breathe as well.

MATTEO recommends sizing up for both: use the King flat sheet (118 x 111 inches) for a Cal King bed, and the Queen flat sheet (100 x 111 inches) for a Full bed. Twin flat sheets measure 79 x 106 inches. All dimensions are listed in both inches and centimeters on the product page.

Garment-dyeing is an artisanal process rather than an industrial one, so MATTEO allows for a shade variation of plus or minus 10% between dye lots. Two sheets ordered in the same color at different times may read as slightly different tones. Darker colorways also carry a contrasting white top-stitch detail along the 1/2-inch hem, which is part of the garment-dyed finish. You can read more about the process at matteola.com/garment-dyeing.

The flat sheet is woven from 100% Egyptian cotton, a natural fiber without synthetic blends, and finished using non-toxic dyes. Garment-washing before sale means the fabric arrives pre-softened, so there is no stiff sizing or chemical finish against the skin on first use. Washing is recommended with a gentle detergent in a lukewarm cycle, which keeps the cotton fibers intact and maintains softness over time.

Wash light and dark colors separately in a lukewarm cycle with a gentle detergent, and avoid overloading the machine, since overcrowding stresses long cotton fibers. Tumble dry on low heat and remove the sheet promptly to reduce wrinkling; line drying gives the best result. Do not use chlorine bleach, alpha hydroxy acids, or benzoyl peroxide on garment-dyed colors, as these whitening agents break down reactive dyes. Bleach is safe only on white cotton.

These flat sheets are part of the MATTEOX clearance offering and may include visible sample flaws such as off-color shades or faded edges; dye-lot tone differences between units in the same color are also possible. Items purchased at 80% to 90% off are returnable for store credit only. All MATTEOX returns are subject to a $10 restocking fee.

The Organic Cotton Sateen has a smooth, subtly silky surface from its sateen weave construction, while MATTEO's Vintage Linen has a textured, dimensional feel from a special washing process that creates highs and lows in the fabric. Cotton sateen at 300 thread count tends to feel warmer and denser against the skin; linen is more breathable and especially well-suited to warm sleepers or humid climates. Both get softer with use, though linen's improvement over time is more pronounced.