Threadmill 100% Cotton Cal King Sheets - 600 TC Sateen Softness

Our review of the Threadmill 100% Cotton Cal King sheets finds them best suited to sleepers who prize a soft, breathable hotel-style bedding set with a secure fit for deep mattresses. The single biggest reason to buy is the combination of a 600 thread count sateen weave and extra-long staple cotton yarns, which produce immediate softness and a cooling hand without feeling heavy. The set arrives as a four-piece bundle and stands out for its deep 16' pockets and all-around elastic that keep the fitted sheet in place on taller or pillow-top mattresses.

Key Features

• 600 thread count sateen: delivers a smooth, slightly lustrous surface that feels soft from the first night and develops a lived-in hand after washing.
• 100% long-staple cotton: provides breathable comfort and durability so the sheets resist pilling and stay comfortable through regular machine washing.
• Extra deep 16' pocket: the fitted sheet fits tall mattresses and pillow-top beds without riding up, supported by elastic all around the skirt.
• 4-piece Cal King set: includes one flat sheet, one fitted sheet, and two king pillowcases sized to match California King bedding needs.
• Cooling, lightweight feel: the sateen weave and cotton yarns help manage night heat and offer a cooler sleep surface for warm sleepers.
• Sustainable packaging and certification: OEKO-TEX certification and zero-plastic packaging reflect environmentally conscious manufacturing.

Who It's For

These sheets are a good match for people who want the soft, shiny feel of higher thread count bedding without a heavy, clingy weave. Couples and hot sleepers who need breathable cotton with a cooling effect will appreciate the lightweight sateen and long-staple cotton yarns.

Shoppers who need fitted sheets for very deep mattresses or pillow-top beds will like the 16' pocket and all-around elastic. If you prefer crisp percale, an ultra-matte finish, or an extremely wrinkle-resistant fabric, you may want to consider other weaves or finishes instead.

Pros & Cons

Pros

• Soft, silky feel right away thanks to the 600 thread count sateen and long-staple cotton.
• Deep 16' pocket and full elastic ensure a snug fit on tall mattresses and pillow-tops.
• Lightweight and breathable construction helps reduce night sweats for warm sleepers.
• OEKO-TEX certification and reusable cotton tote packaging add sustainable value.

Cons

• Sateen weave has a slight sheen and can show wrinkles more than percale styles, which some users note affects wrinkle resistance.

Specifications

Material	100% long-staple cotton
Weave	Sateen
Thread count	600
Set contents	1 flat sheet, 1 fitted sheet, 2 king pillowcases
Fitted sheet size	72in W x 84in L with 16in deep pocket
Flat sheet size	108in W x 102in L
Certifications & packaging	OEKO-TEX certified, zero-plastic reusable cotton tote

Our Verdict

The Threadmill Cal King 600 TC cotton sheets are a strong choice for anyone seeking a soft, breathable, hotel-like set that stays put on deep mattresses. With durable long-staple yarns, a cooling sateen hand, and practical deep pockets, they offer solid value for the price and thoughtful sustainable touches that appeal to eco-minded buyers.

Frequently Asked Questions

Are these sheets truly cotton?
Yes, they are made from 100% long-staple cotton, woven in a sateen for softness and breathability.

Will the fitted sheet fit a pillow-top mattress?
Yes, the fitted sheet has a 16in deep pocket and elastic all around, designed to fit tall and pillow-top mattresses securely.

How should I care for these sheets to keep them soft?
Machine wash at room temperature and tumble dry on low; remove promptly from the dryer to reduce wrinkles and preserve softness.