Sei Duvet Cover

Name: Sei Duvet Cover - Clearance 50
Brand: MATTEO
SKU: 507070X5

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

$272.50 ~~$545.00~~

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, making it MATTEO's highest thread count fabric. The sateen construction gives the face of the cover a smooth, silky hand feel, while garment-washing softens the fabric before it reaches you. It is designed and manufactured by MATTEO in Los Angeles.

Is a 600 thread count duvet cover actually softer than lower thread counts?

Thread count measures the density of the weave, not the softness of the underlying cotton or the quality of the yarn. At MATTEO, we stopped at 600 TC because counts above that typically produce fabric that is stiff and does not breathe well. The Sei uses a 120/2 Ne yarn in both warp and weft, which is what delivers its particular softness rather than the number alone. A well-constructed 300 TC percale and a 600 TC sateen simply feel different, and the right choice depends on whether you prefer crisp or silky.

What sizes does the Sei Duvet Cover come in?

The Sei Duvet Cover is available in Twin (71 x 86 in / 180 x 218 cm), Full (82 x 86 in / 208 x 218 cm), Queen (90 x 94 in / 229 x 239 cm), and King (108 x 94 in / 274 x 239 cm). Select your size at checkout; availability varies by colorway.

How do I care for a garment-dyed cotton sateen duvet cover?

Machine wash in lukewarm water with a gentle detergent, separating light and dark colors, and avoid overloading the machine to protect the long cotton fibers. Tumble dry on low heat and remove promptly to reduce wrinkling; line drying gives the best result. Do not use chlorine bleach, alpha hydroxy acids, or benzoyl peroxide on garment-dyed colorways, as the reactive dyes are not resistant to whitening agents. If you prefer a pressed finish, iron while slightly damp on the Lightweight Cotton or Medium setting.

Does the Sei Duvet Cover have a zipper or button closure?

The Sei Duvet Cover has a hidden YKK zipper closure at the bottom, finished with a plain knife-edge seam and a double-stitch detail. YKK hardware is specified because it holds up through repeated washing without snagging the fabric.

Is the Sei Duvet Cover a good choice for hotel-quality sleep at home?

The 600 TC sateen weave, garment-washed finish, and YKK zipper hardware are all construction details associated with hotel-grade bedding. The silky face of the sateen and the pre-washed softness mean the cover feels broken-in from the first night rather than stiff. Interior designers and hospitality specifiers often look for exactly this combination: a smooth, durable cotton with a finish that holds its hand through repeated laundering.

What is garment-washing and how does it affect the Sei Duvet Cover?

Garment-washing is a finishing process applied after the cover is fully constructed, which pre-shrinks the fabric and relaxes the fibers before the product reaches you. On the Sei, this means the 600 TC sateen arrives with a softer, more settled feel rather than the stiff finish common in high thread count fabrics straight off the loom. It also introduces a slight variation in the dye, a characteristic of garment-dyeing that MATTEO allows for a shade variation of +/- 10% between dye lots. You can learn more about the garment-dyeing process here.

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

The Sei is one of MATTEO's most enduring fabrics, and the 600 TC sateen in colorways like White, Moon, and Off White translates well as a registry or gift selection for couples setting up a bedroom. The garment-washed finish and YKK zipper hardware make it a long-term piece rather than a one-season purchase. If you are building a registry, pairing the Sei Duvet Cover with a matching sheet set gives a cohesive, hotel-quality result.