Sei Sham Single

Name: Sei Sham Single - Clearance 50
Brand: MATTEO
SKU: 507083X5

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

$62.50 ~~$125.00~~

Size:

King

Euro

Queen

Quantity:

Variant

Description

Sei shams have a 1/2" micro-flange with double stitch detail and an envelope closure to hold your pillow insert snugly in place.

Contrasting white double stitch detail.

Sham vs. Pillowcase

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

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.Â 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 36	51 x 91
Queen	20 x 30	51 x 76
Euro	26 x 26	66 x 66

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 Sham made from, and what is the thread count?

The Sei Sham is 100% cotton in a sateen weave at 600 thread count, making it the highest thread count fabric in the MATTEO collection. It is garment-washed after construction, which gives it an immediate softness without stiffness. The 120/2 Ne yarn runs in both warp and weft, producing an exceptionally balanced weave with a silky face and a clean, even hand.

Is a higher thread count always better for pillow shams?

Thread count measures the density of the weave, nothing more. It does not reflect the softness of the raw cotton, the smoothness of the yarn, or the balance of the fabric construction. MATTEO caps Sei at 600 thread count deliberately: fabrics woven above that threshold typically become stiff and dense, limiting breathability and drape. A well-constructed 600 TC sateen with fine yarn will outperform a poorly constructed 800 TC sham in both feel and longevity.

What is the difference between a pillow sham and a pillowcase?

A pillowcase loosely encases the pillow and is open on one side, while a sham is more fitted and uses a closure method to keep the insert in place. The Sei Sham has an envelope closure at the back and a 1/2" micro-flange border with contrasting white double-stitch detail, giving it a finished, tailored appearance suitable for the face of the bed. Pillowcases are generally used for sleeping; shams are used for presentation and can be removed at night.

What sizes does the Sei Sham come in?

The Sei Sham is available in three sizes: Queen (20 x 30 inches / 51 x 76 cm), King (20 x 36 inches / 51 x 91 cm), and Euro (26 x 26 inches / 66 x 66 cm). The envelope closure holds the pillow insert securely in each size without requiring buttons or zippers.

How do I wash and care for the Sei Sham?

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. For garment-dyed colorways, avoid any products containing chlorine bleach, alpha hydroxy acids, or benzoyl peroxide, as these will damage the reactive dyes. If you prefer a crisp finish, press while slightly damp on the Lightweight Cotton or Medium iron setting.

Does the Sei Sham work with hotel-quality bedding setups?

The Sei Sham is built to the same construction standards found in high-end hotel bedding: 100% long-staple cotton, 600 thread count sateen weave, garment-washed for immediate softness, and finished with a 1/2" micro-flange and clean double-stitch detail. The white colorway pairs directly with white sheet sets and duvet covers for a hotel-quality bed presentation. MATTEO designs and manufactures all Sei products in Los Angeles.

Can the Sei Sham be used for sensitive skin?

Sei is woven from 100% cotton with no synthetic fiber blends, and MATTEO uses non-toxic dyes throughout the garment-dyeing process. The sateen weave has a smooth face with minimal surface texture, which reduces friction against the skin compared to percale or twill constructions. For anyone with skin sensitivity, the garment-washing process also removes residual manufacturing finishes before the sham reaches you.

How does the Sei Sham fit into a layered luxury bedding setup?

The Sei Sham is designed to coordinate with other pieces in the Sei Cotton Collection, including flat sheets, fitted sheets, and duvet covers, all woven from the same 600 thread count sateen fabric. Its micro-flange border and contrast stitch give it a clean, geometric edge that reads well against both solid and textured duvet covers. Interior designers working with a minimalist, California-cool aesthetic often use Euro shams stacked in front of King or Queen shams to add depth without visual clutter. The full Sei collection is available at matteola.com.