Threadmill Supima Cotton 1200TC King Sheet Set — Sateen Dark Grey, 4-Piece, 17" Deep Pocket & OEKO-TEX

The Threadmill 1200TC Supima Cotton King sheet set is a four-piece sateen collection made from 100% Supima cotton that delivers a silky, hotel-style feel with deep pockets for a secure fit.

These sheets combine long-staple Supima fibers with a high-count sateen weave to produce a soft, lustrous surface that smooths onto the mattress and stays comfortable year-round. Finished and woven for durability, the set includes a flat sheet, a deep-pocket fitted sheet, and two king pillowcases. Thoughtful details — like OEKO-TEX certification, fade resistance, and packaging in a reusable tote — make this an upscale option for those who value fabric quality and responsible manufacturing.

How does the 1200 thread count affect feel and durability?

A 1200 thread count here represents a fine, dense weave using Supima long-staple yarns rather than simply stacked plies. That produces a buttery hand and a smooth sheen without sacrificing breathability. Because Supima fibers are longer and stronger, the fabric resists pilling and holds color longer than lower-quality cottons.

• Silky, sateen finish with a subtle luster for a hotel-style look
• Long-staple Supima fibers for enhanced strength and less pilling
• High-count weave that remains breathable for balanced warmth

Will the deep pocket fitted sheet stay put on a thick mattress?

The fitted sheet is cut with a deep 17-inch pocket and fitted with an all-around elastic to hug mattress corners and sides. This design reduces slipping and bunching on tall mattresses, hybrid models, or those topped with a mattress pad. The elastic runs continuously to help the sheet stay secure through movement and overnight turns.

• 17-inch deep pocket accommodates thick mattresses and toppers
• All-around elastic edge for consistent hold on corners and sides
• King dimensions sized to standard US king mattresses for a tailored fit

How should I care for these Supima sateen sheets to maintain their look?

To preserve the fabric’s sheen and softness, machine wash in cool or room-temperature water and use a gentle cycle. Avoid high-heat drying; remove sheets promptly and fold to reduce wrinkles and minimize shrinkage. Following the maker’s instructions will help maintain colorfastness and the smooth hand of the sateen weave.

• Machine wash cool; gentle cycle recommended
• Tumble dry low and remove promptly to limit wrinkles
• Fold or hang shortly after drying to keep the sateen finish

What certifications and sustainability features does this set include?

The Threadmill set is OEKO-TEX certified, indicating the textiles are free from many harmful substances commonly restricted in consumer fabrics. Production uses renewable energy sources such as wind and solar, and the sheets are delivered in a reusable cotton tote. These choices reflect an emphasis on traceability and reduced environmental impact during manufacturing.

• OEKO-TEX certification for textile safety
• Manufactured in a wind and solar powered facility
• Packaged in a reusable cotton tote for reduced waste

Who is this for: The Threadmill 1200TC Supima Cotton King Sheet Set is aimed at sleepers who want a luxe, hotel-like bed with sturdy construction and a smooth sateen surface. It's a good pick for those with deep mattresses or toppers, shoppers who prefer long-staple cotton for longevity, and anyone seeking responsibly made linens with premium finishing and easy care.