100% Cotton 17" Deep Pocket Fitted Sheet — Fits Thick Mattresses Quick answer: This is a 100% cotton fitted sheet with a deep 17-inch pocket, built to fit thick, pillow-top, and contoured mattresses that standard sheets pop off of. Real single-ply 300 thread count, breathable, hypoallergenic, and available in four colours. If your fitted sheet keeps slipping off the corners, the usual cause is a pocket that's too shallow for your mattress. The 17" deep pocket here grips taller mattresses (including those with a topper) and stays put. WHO THIS IS FOR: Anyone with a thick, pillow-top, or extra-deep mattress (up to ~17") Anyone adding a mattress pad or topper who needs extra pocket depth Hot and cold sleepers who want breathable natural cotton Sensitive skin — cotton is naturally hypoallergenic SPECIFICATIONS: Detail Specification Material 100% Cotton (single-ply) Thread Count 300 TC Pocket Depth 17 inches (43 cm) Colours White, Grey, Pale Blue, Khaki Care Machine washable; softens with every wash Origin Made in China SIZES & DIMENSIONS (with 17" pocket): Size Dimensions Twin 38" × 75" + 17" (96.5 × 190.5 + 43 cm) Double/Full 54" × 75" + 17" (137 × 190.5 + 43 cm) Queen 60" × 80" + 17" (152.4 × 203.2 + 43 cm) King 78" × 80" + 17" (198.1 × 203.2 + 43 cm) FREQUENTLY ASKED QUESTIONS Will this fit my deep mattress?Yes — the pocket is 17 inches deep, which fits most thick, pillow-top, and contoured mattresses, including a mattress with a topper added. Measure your mattress height; if it's 17" or less, this fits. What's the difference between a deep pocket and a standard fitted sheet?Standard fitted sheets have a pocket depth of 9–12 inches. A deep pocket sheet like this one has a 17-inch pocket, designed specifically for thicker mattresses, pillow-tops, and mattresses with a topper. If your current sheet pops off the corners, you likely need a deeper pocket. What mattress thickness does a 17-inch pocket fit?It fits mattresses up to 17 inches tall. This includes most standard mattresses with a mattress topper added, as well as thick pillow-top and euro-top mattresses. Measure from the floor to the top of your mattress (not including bedding) to confirm. Is this sheet good for hot sleepers?Yes. 100% cotton is one of the most breathable natural fibres available. Unlike polyester blends, cotton wicks moisture and allows airflow, helping regulate temperature through the night. This makes it a strong choice for warm sleepers. Why does my old fitted sheet keep slipping off?Almost always because its pocket is too shallow for your mattress height. A deep-pocket sheet like this grips taller mattresses and stays on the corners. Is 300 thread count cotton good?Yes. This is honest single-ply 300TC cotton — soft, breathable, and durable, and it softens further with each wash. It avoids the inflated thread-count claims common on lower-grade fibre. Can I machine wash it?Yes, it's fully machine washable and low-maintenance. Do you have matching bedding?Yes — matching colours are available in our cotton duvet covers and other sheet sets. Complete the set: add a matching combed cotton duvet cover or browse Complete Your Bed. WHY DOWN UNDER BEDDING?Canada's trusted source for premium natural bedding for over 30 years. Free shipping across Canada. {"@context":"https://schema.org","@type":"FAQPage","mainEntity":[{"@type":"Question","name":"Will this fit my deep mattress?","acceptedAnswer":{"@type":"Answer","text":"Yes — the pocket is 17 inches deep, which fits most thick, pillow-top, and contoured mattresses, including a mattress with a topper added. Measure your mattress height; if it's 17\" or less, this fits."}},{"@type":"Question","name":"What's the difference between a deep pocket and a standard fitted sheet?","acceptedAnswer":{"@type":"Answer","text":"Standard fitted sheets have a pocket depth of 9–12 inches. A deep pocket sheet like this one has a 17-inch pocket, designed specifically for thicker mattresses, pillow-tops, and mattresses with a topper. If your current sheet pops off the corners, you likely need a deeper pocket."}},{"@type":"Question","name":"What mattress thickness does a 17-inch pocket fit?","acceptedAnswer":{"@type":"Answer","text":"It fits mattresses up to 17 inches tall. This includes most standard mattresses with a mattress topper added, as well as thick pillow-top and euro-top mattresses. Measure from the floor to the top of your mattress (not including bedding) to confirm."}},{"@type":"Question","name":"Is this sheet good for hot sleepers?","acceptedAnswer":{"@type":"Answer","text":"Yes. 100% cotton is one of the most breathable natural fibres available. Unlike polyester blends, cotton wicks moisture and allows airflow, helping regulate temperature through the night. This makes it a strong choice for warm sleepers."}},{"@type":"Question","name":"Why does my old fitted sheet keep slipping off?","acceptedAnswer":{"@type":"Answer","text":"Almost always because its pocket is too shallow for your mattress height. A deep-pocket sheet like this grips taller mattresses and stays on the corners."}},{"@type":"Question","name":"Is 300 thread count cotton good?","acceptedAnswer":{"@type":"Answer","text":"Yes. This is honest single-ply 300TC cotton — soft, breathable, and durable, and it softens further with each wash. It avoids the inflated thread-count claims common on lower-grade fibre."}},{"@type":"Question","name":"Can I machine wash it?","acceptedAnswer":{"@type":"Answer","text":"Yes, it's fully machine washable and low-maintenance."}},{"@type":"Question","name":"Do you have matching bedding?","acceptedAnswer":{"@type":"Answer","text":"Yes — matching colours are available in our cotton duvet covers and other sheet sets."}}]} {"@context":"https://schema.org","@type":"Product","name":"100% Cotton 17\" Deep Pocket Fitted Sheet","description":"100% cotton fitted sheet with a 17-inch deep pocket for thick mattresses. Soft, breathable, hypoallergenic, and machine washable. Available in Twin, Double/Full, Queen, and King in White, Grey, Pale Blue, and Khaki.","brand":{"@type":"Brand","name":"Down Under Bedding"},"material":"100% Cotton","color":"White, Grey, Pale Blue, Khaki","offers":{"@type":"AggregateOffer","lowPrice":"59.99","highPrice":"89.99","priceCurrency":"CAD","availability":"https://schema.org/InStock","seller":{"@type":"Organization","name":"Down Under Bedding"}}}
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