• Off White Cotton Sei Pillowcase Pair - Overhead Bed View | MATTEO
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Sei Pillowcase Pair

Sei Pillowcase Pair

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

$90
$225 $90
Sale Sold out

MATTEOX Exclusive, 40% discount auto-applies at checkout.

Color Off White
Size Size guide

Description

Each pillowcase pair consists of two pillowcases.

Sei pillowcases are finished with a half inch hem with a double stitch detail. Darker colors feature a contrasting white top stitch detail.

Pillowcase vs. Sham

Pillowcases and Shams are both used to protect pillow inserts, but there are a wide variety of constructions. Typically, pillowcases loosely encase the pillow and are open on the side, whereas shams are more fitted and employ some method of closure to keep the pillow in place.

We recommend using a Queen pillowcase for a Standard pillow insert as we do not offer a Standard pillowcase. The pillowcase will hang a bit longer over the edge of the insert. It can be tucked in to create an envelope closure or taken to a seamstress for a simple alteration.

  • 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 20 x 39 51 x 99
Queen 20 x 33 51 x 84

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. Products purchased at 50% off are eligible for a full refund. Products purchased at 60% off are only eligible for exchanges or store credit. Products purchased at 80% off or below are FINAL SALE.

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Frequently asked questions

What fabric is the Sei Pillowcase Pair made from?
The Sei Pillowcase Pair is 100% cotton in a sateen weave, with a 600 thread count — MATTEO's highest. The fabric uses the same 120/2 Ne yarn in both warp and weft, which produces the characteristic silky face and fluid drape of a true sateen. Each pillowcase is garment-washed after construction, so the cotton arrives already broken in.

Is a 600 thread count pillowcase actually better than lower thread counts?
Thread count measures weave density — the number of individual yarns per square inch — but it does not account for yarn quality, fiber softness, or weave balance. MATTEO has not gone above 600 TC because higher counts tend to produce a stiff, dense fabric with reduced breathability. The Sei fabric reaches 600 TC while staying soft and fluid by using fine 120/2 Ne yarn rather than multi-ply threads that inflate the count artificially.

What sizes does the Sei Pillowcase Pair come in, and will it fit a standard pillow?
The Sei Pillowcase Pair is available in Queen (20 x 33 inches / 51 x 84 cm) and King (20 x 39 inches / 51 x 99 cm). MATTEO does not offer a Standard size; a Queen pillowcase works on a standard pillow insert and will extend slightly past the edge. That excess can be tucked under the pillow to create a clean envelope closure, or taken to a seamstress for a simple alteration.

What is the difference between a pillowcase and a pillow sham?
A pillowcase loosely encases the pillow with an open side, making it easy to slip on and off. A sham is more fitted and uses a closure — a zipper, flap, or button — to hold the insert in place, which is why shams are more common on decorative pillows at the head of the bed. The Sei Pillowcase has an open side construction with a half-inch hem and double-stitch detail, keeping the profile clean without added hardware.

How should I wash and care for the Sei cotton sateen pillowcases?
Wash light and dark colors separately in a lukewarm cycle with gentle detergent and a cool rinse; do not overload the machine, as this can damage the long cotton fibers. Tumble dry on low heat and remove promptly to reduce wrinkling — line drying gives the best result. Bleach is safe on white Sei pillowcases only; avoid chlorine bleach, alpha hydroxy acids, and benzoyl peroxide on garment-dyed colors, as these break down the reactive dyes used in the garment-dyeing process.

What does garment-washed mean, and how does it affect the Sei pillowcase?
Garment-washing means the pillowcases go through a controlled wash process after they are fully sewn, not while the fabric is still on the bolt. This pre-softens the cotton fibers and gives the Sei its immediate silky hand rather than the stiffness common in unwashed sateen straight off the loom. Because garment-dyeing is an art rather than a precise science, MATTEO allows for a +/- 10% shade variation between dye lots. Learn more about MATTEO's garment-dyeing process.

Are the Sei Pillowcases a good choice for people with sensitive skin?
The Sei Pillowcase Pair is made from 100% cotton with no synthetic fibers, and MATTEO uses non-toxic dyes throughout its garment-dyeing process. Cotton sateen at 600 thread count has a smooth, low-friction face, which reduces mechanical irritation against skin compared to coarser weaves. The garment-washing process removes residual finishing agents from the fabric before it reaches you, so there is no need to pre-wash before first use.

Can I use the Sei Pillowcase Pair as part of a luxury cotton bedding set?
The Sei Pillowcase Pair is designed to coordinate directly with other Sei fabric pieces, including fitted sheets, flat sheets, and duvet covers, all in the same 100% cotton sateen 600 TC construction. MATTEO offers the collection in fifteen colors across neutral and deep tones, from White and Off White to Coal and Night, so the pillowcases can anchor a monochromatic bed or work as a contrast layer within a larger luxury cotton bedding set. Darker Sei colors carry a contrasting white topstitch detail at the hem, which adds a quiet graphic note without additional pattern.