Frequently asked questions
What fabric is the Sei Swatch made from, and what are its specs?
The Sei Swatch is 100% cotton in a sateen weave at 600 thread count, garment-washed and designed by MATTEO in Los Angeles. It uses a 120/2 Ne yarn in both warp and weft, which gives the face of the fabric its characteristic silky hand while maintaining a balanced, hotel-worthy finish for a crisp, cool sleep.
How big is each fabric swatch, and how do I order one?
Each swatch is 10 x 10 inches (25 x 25 cm) and is available in 15 Sei colorways, including White, Off White, Greige, and Coal. Order directly from the Fabric Swatches collection to see and feel the exact color and weight before committing to a full Sei Flat Sheet or bedding set.
Why does MATTEO cap thread count at 600 TC instead of going higher?
Thread counts above 600 typically require folded or multi-ply yarns that add density without improving softness, producing a fabric that is stiff and does not breathe. Sei achieves its silky quality through yarn caliber and weave balance, not by inflating the count, which is why it sleeps cooler and moves more freely than many higher-count alternatives.
How should I care for Sei cotton sateen bedding after washing?
Machine wash in lukewarm water with a gentle detergent, keeping light and dark colors separated, and tumble dry on low heat. Because Sei is garment-dyed using reactive dyes, avoid chlorine bleach or products containing whitening agents on colored variants; bleach is safe on white cotton only.
