Sei Duvet Cover

Name: Sei Duvet Cover - Clearance 60
Brand: MATTEO
SKU: 168211X6

100% Cotton | 600 Thread Count | Sateen Weave | Garment-Dyed

$178.00 ~~$445.00~~

Size:

King

Queen

Twin

Quantity:

Variant

Description

Our Sei duvet covers are finished with plain knife edge seam with a double stitch detail at the bottom of the duvet covering a hidden YKK zipper closure

100% cotton
Sateen weave
600 thread count
Garment-washed

Fabric

Sei is our highest thread count fabric at 600 TC. We are not myopically focused on thread count at MATTEO. Thread count is one among many measurements of quality in the world of bed linens. The most simple definition of thread count is to take a pair of scissors and cut out a square inch of fabric and count each individual yarn (or thread). This is the thread count and, as such, thread count is simply a definition of the density of the weave. It does not take into consideration the softness of the raw cotton used or the size and smoothness of the yarn, nor does it measure the balance of the weave. Focusing only only thread count is similar to deciding which beer to drink by only measuring its alcohol content.

We have not yet gone above 600 thread count at MATTEO because higher counts typically produce a stiff and dense fabric that does not move or breathe. All sateens (or satin) fabrics have a face which is softer and a backside which is rougher. This is what creates the "silky" feel that customers love so much. And our customers love Sei because it is one of the purest, softest, and silkiest fabrics on the market.

Care Details

Wash

Wash should be separated into light & dark colors. Do not overload machine as this will damage long cotton fibers. We recommend a lukewarm wash cycle with a gentle detergent & a cool rinse.

Bleach may be used on white cotton bed linens only. Avoid using products that contain whitening agents such as chlorine bleach, alpha hydroxy acids and benzoyl peroxide on garment-dyed items. The reactive dyes used for garment-dyeing are not resistant to these whitening agents.

The largest challenge with garment-dyeing is the truth that it is an art, and not a science. We must allow for a shade variation of +/- 10% from dye-lot to dye-lot.

Learn more about Garment-Dyeing.

Drying

Tumble dry with low heat.Remove bed linens promptly from the machine to reduce wrinkling. For best results, line dry.

Ironing

We at MATTEO tend to prefer a lived-in look, as such, you don't find us ironing our sheets too frequently. If you prefer a crisp looking bed, our cotton bed linens should be pressed while slightly damp using the Lightweight Cotton or Medium setting.

Size

	inches	cm
King	108 x 94	274 x 239
Queen	90 x 94	229 x 239
Full	82 x 86	208 x 218
Twin	71 x 86	180 x 218

Important Notice

All products purchased from the MATTEOX clearance page are samples that might exhibit visible flaws, including, but not limited to, off-color shades, incorrect threads, and faded edges. Products purchased in the same color might be different tones owing to differences from their respective dye lots. All products purchased at 50% to 70% off can be returned for a full refund or store credit. All products purchased at 80% to 90% off can only be returned for store credit. All returns involving a MATTEOX product are subject to a $10 restocking fee.

Frequently Asked Questions

What fabric is the Sei Duvet Cover made from?

The Sei Duvet Cover is 100% cotton in a sateen weave with a 600 thread count, garment-washed for an immediate softness. Sei is MATTEO's highest thread count fabric, woven with 120/2 Ne yarn in both warp and weft, which produces the characteristic silky face that sateen is known for. Designed and manufactured in Los Angeles, it uses non-toxic dyes throughout.

Is 600 thread count actually better for a duvet cover?

Thread count measures the density of the weave, not the softness of the raw cotton or the balance of the yarn. At MATTEO, we stopped at 600 TC because counts above that typically produce a stiff, dense fabric that traps heat and doesn't drape well. The Sei fabric reaches 600 TC while maintaining the breathability and fluid drape that makes a sateen duvet cover feel genuinely luxurious, not just heavy.

What sizes does the Sei Duvet Cover come in?

The Sei Duvet Cover is available in Twin (71 x 86 inches), Full (82 x 86 inches), Queen (90 x 94 inches), and King (108 x 94 inches). All dimensions are finished sizes after garment-washing. If you are pairing the duvet cover with a comforter insert, use the insert size as your reference rather than your mattress size.

How should I wash and care for the Sei Duvet Cover?

Wash the Sei Duvet Cover in lukewarm water with a gentle detergent, separating light and dark colors, and avoid overloading the machine since this can damage the long cotton fibers. Tumble dry on low heat and remove promptly to minimize wrinkling; line drying gives the best results. For garment-dyed colors, avoid bleach, chlorine-based products, alpha hydroxy acids, and benzoyl peroxide, as these will strip the reactive dyes. White versions can be bleached safely. Learn more about our garment-dyeing process.

Does the Sei Duvet Cover work for hot sleepers or sensitive skin?

The 100% cotton sateen construction allows more airflow than synthetic or blended fabrics, making it a reasonable choice for sleepers who run warm. The garment-washing process removes residual finishing chemicals, so the fabric arrives soft against the skin from the first night. MATTEO uses non-toxic dyes throughout, which reduces the risk of irritation for people with reactive skin.

What finish and closure does the Sei Duvet Cover have?

The Sei Duvet Cover has a plain knife-edge seam with a double-stitch detail along the bottom edge and a hidden YKK zipper closure. The knife-edge finish gives the duvet cover the clean, tailored look that interior designers use to achieve a hotel-quality bed. YKK zippers are the industry standard for smooth, long-lasting operation.

Is the Sei Duvet Cover a good choice for a wedding registry or gift?

The Sei Duvet Cover is one of the more considered registry additions you can make: 100% cotton sateen at 600 thread count, garment-washed, and available in fifteen colors from White and Off White through Coal and Night. The color range gives couples flexibility to match existing or planned bedroom schemes, and the quality holds across years of regular washing. MATTEO ships from Los Angeles and can be ordered in Twin, Full, Queen, or King.

What does garment-washed mean for the Sei Duvet Cover, and will the color vary?

Garment-washing means the finished duvet cover, not the raw fabric, is washed using a special process that relaxes the fibers and gives the sateen its soft, lived-in feel from day one. Because garment-dyeing is an artisanal process rather than an industrial one, MATTEO allows for a shade variation of plus or minus 10% from dye-lot to dye-lot. Two Sei covers ordered at different times in the same color may have a slight tonal difference, which is a natural characteristic of the process.