Sei Pillowcase Single

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

$125.00

Size:

King

Queen

Quantity:

Variant

Description

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 on 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

Frequently Asked Questions

What fabric is the Sei Pillowcase made from, and what makes it different from other cotton pillowcases?

The Sei Pillowcase is 100% cotton in a sateen weave at 600 thread count, garment-washed and designed by MATTEO in Los Angeles. What sets it apart is the 120/2 Ne yarn used in both warp and weft, which produces an unusually balanced, silky-smooth face without the stiffness that higher thread counts typically introduce. It delivers a hotel-style finish, the kind of crisp, cool sleep surface you find in high-end hotel suites, without sacrificing breathability.

Is 600 thread count too high for a pillowcase to breathe properly?

At MATTEO, 600 TC is the ceiling by design: thread counts above that tend to produce dense, stiff fabric that traps heat. The Sei sateen weave at 600 TC stays on the right side of that line, remaining smooth and fluid rather than rigid, so it sleeps cool rather than close.

What size Sei Pillowcase should I order for a standard pillow insert?

MATTEO does not offer a Standard size; the Queen pillowcase (20 x 33 inches / 51 x 84 cm) is the recommended fit for a standard pillow insert. The extra length can be tucked under the insert to create an envelope-style closure, or a seamstress can take it in with a simple alteration.

How should I wash and care for the Sei Pillowcase to keep its silky finish?

Machine wash in lukewarm water with a gentle detergent, keeping light and dark colors separated, and avoid overloading the machine, which can stress the long cotton fibers. Tumble dry on low heat and remove promptly to limit wrinkling; line drying gives the best results. Because the Sei is garment-dyed using reactive dyes, skip any products containing chlorine bleach, alpha hydroxy acids, or benzoyl peroxide on colored versions, as these will strip the dye.