This guide covers the Pure Earth Organic 300 Thread Count 6-piece Sheet Set listed by Costco. Product details and inventory can vary by seller, size and color. It is a specification-based guide, not a new wash or sleep test.
Materials, weave and what is included
Costco lists the set as 100% organic cotton with a 300-thread-count sateen weave. Sateen generally has a smoother surface and more drape than a crisp percale. Thread count alone does not determine quality or lifespan: yarn, weave, finishing and care also matter.
Costco describes a six-piece set and states that the fitted sheet fits a mattress up to 18 inches deep. Check the item’s current size chart for the precise dimensions and pieces supplied; measure your mattress plus any topper. Pocket depth is a maximum, so an unusually thin mattress may leave extra fabric.
| Feature | What to know |
|---|---|
| Fiber | Organic cotton according to the referenced listing |
| Weave | Sateen; generally smooth and draping rather than crisp percale |
| Thread count | 300; one specification, not a durability guarantee |
| Fit | Listing states up to 18-inch mattress depth; confirm your size |
| Set | Six pieces in the referenced listing; verify individual contents |
Pros and considerations
| Potential advantages | What to check |
|---|---|
| The referenced set uses organic cotton sateen and has a published GOTS certification number. | Certification has a defined scope and does not guarantee comfort or allergy-free use. |
| Standard-size configurations list four pillowcases. | Check the exact size: the split configuration is described differently in Costco’s dimensions. |
| The listing says the fitted sheet accommodates mattresses up to 18 inches. | Measure mattress and topper together; the listed fitted-sheet dimensions include a 16-inch depth. |
Feel, temperature and care
Cotton sateen is a useful option for someone who likes a smoother, less papery hand. A lightweight cotton percale may feel crisper; linen has a more textured feel. Sleep temperature is personal and depends on the whole bed and room, so no fiber can promise that you will remain cool all night.
Follow the care label on the set you purchase. Washing before use, avoiding an overloaded machine and removing sheets promptly from the dryer can help maintain them, but do not substitute generic advice for the product’s specific temperature and drying instructions. Wrinkles and changes in feel are normal possibilities with cotton.
Standard and split sizes: check the pieces
For the referenced queen set, Costco lists one flat sheet, one fitted sheet and four standard pillowcases. Its split-king dimensions list a flat sheet, two fitted sheets and four king pillowcases, despite the page’s “six-piece” title. Because that detailed list totals seven items, confirm the current package contents with Costco before ordering rather than assuming the title resolves the difference.
On an adjustable split bed, check the dimensions of each mattress half and the listed fitted sheets individually. Also consider the flat sheet’s width if you and a partner prefer separate covers. For a single-piece bed, compare the fitted dimensions with both mattress length and width as well as the combined height of any topper.
What organic certification and EarthColors mean
The referenced Costco listing identifies GOTS certification and lists a certification number. The Global Organic Textile Standard sets requirements for certified textile processing and organic fibers; check the current label or listing to understand the certificate’s scope. Certification is not proof that every person will tolerate the fabric or that production has no environmental impact.
Costco describes EarthColors dyes as synthesized using non-edible agricultural or herbal-industry waste such as leaves and nutshells. That describes a feedstock; it does not establish that the finished sheet contains no chemicals, that every component is biodegradable in every setting, or that the dyes eliminate allergy risk.
What to check before ordering
- Size and depth: measure the mattress and topper and compare the exact fitted sheet dimensions.
- Pieces: verify the number and size of pillowcases and whether both flat and fitted sheets are included.
- Price and access: check the current total, delivery and any membership requirements at the retailer.
- Returns: confirm the applicable policy for opened or washed bedding.
- Allergies: select materials based on your known triggers. A “hypoallergenic” label is not a guarantee.
How to compare the complete price
Compare the price for your size and pattern along with delivery charges and retailer requirements. Four included pillowcases can be useful if you use several pillows; if you only need two, compare the total against a smaller set rather than assuming more pieces mean better value for you. Review the seller’s policy before washing the sheets, especially if the option to return them matters.
For a comparison of feel, see our California Design Den review, which covers another cotton sateen set. These are different products: check their individual fit, certifications and package contents.
Common questions
Are Pure Earth sheets 100% cotton?
The referenced 300-thread-count set is listed as 100% organic cotton. Check the label for any other Pure Earth product.
Is 300 thread count automatically better?
No. Thread count is one detail, not a reliable stand-alone measure of softness or durability.
Does the split king contain two fitted sheets?
Costco’s detailed dimensions list two split fitted sheets. Its overall title says six pieces even though the split-size list describes seven, so confirm the package before ordering.
How should the set be washed?
The referenced listing says to wash before first use, use a warm delicate cycle with like colors, avoid bleach and tumble dry low. Follow the current label for your set.
Are organic cotton sheets allergy-proof?
No textile can guarantee that. Check the entire material list and discuss persistent symptoms with a clinician.