Best King Sheets for Thick Mattresses With Extra Deep Pockets
Choosing the perfect king sheets for thick mattresses ensures a comfortable, snug fit without slipping off during the night. This guide covers top-rated extra deep sheets and mattress toppers designed to fit mattresses with depths ranging from 18 to 24 inches or more. Below is a summary table of some of the best available options combining softness, breathability, and durability for extra thick mattresses.
| Product Name | Brand | Mattress Depth Fit | Key Features |
|---|---|---|---|
| Extra Deep King Sheet Set – 6 Piece Breathable & Cooling Sheets | CGK Unlimited | 18-24 Inches | Stretchable elastic, wrinkle free, breathable, pillowcases with decorative embroidery |
| Shilucheng 100% Viscose Derived from Bamboo Sheets | Shilucheng | 18-24 Inches | Silky soft, cool & breathable bamboo fabric, strong twill weave, fits extra tall mattresses |
| King Fitted Sheet Deep Pocket – Extra Deep 17″-21″ | DeaLuxe | 17-21 Inches | Super soft microfiber, reinforced elastic for snug fit, ideal for pillow tops & mattress toppers |
| Mellanni King Sheets Set – 4 PC Iconic Collection Bedding | Mellanni | Fits up to 16 Inches | Ultra-soft microfiber, wrinkle & fade resistant, breathable for year-round comfort |
| ELEMUSE King Mattress Topper – Extra Thick Pillowtop Mattress Pad | ELEMUSE | 8-21 Inches | Overfilled down alternative, extra thick comfort, deep pockets with box sewing for even fill |
Extra Deep King Sheet Set – 6 Piece Breathable & Cooling Sheets

The CGK Unlimited Extra Deep King Sheet Set is specifically designed for very deep pocket mattresses measuring from 18 up to 24 inches. Its fitted sheet features stretchable elastic all around, ensuring a snug, secure fit that won’t slip off, even with tall or pillow-top mattresses. The set includes six pieces: a fitted sheet, flat sheet, and four pillowcases, each with a decorative embroidery detail for an elegant look.
These sheets are breathable and cooling, providing comfort throughout the night while maintaining a wrinkle-free and super soft texture. They are ideal for mattresses with a thick memory foam topper or pillow tops, offering an easy fit without sacrificing style or practical functionality.
Shilucheng 100% Viscose Derived from Bamboo Sheets

Made from 100% rayon derived from bamboo, the Shilucheng sheet set offers an ultra-smooth and silky touch, with a unique twill weave that enhances strength and durability beyond traditional cotton sheets. These sheets naturally regulate temperature, staying around 3 degrees cooler than cotton or linen alternatives, providing superior breathability and moisture-wicking abilities.
The set fits extra-deep mattresses between 18 and 24 inches, perfect for thick memory foam or pillow-top mattresses. It includes a fitted sheet, flat sheet, and two pillowcases, designed not to slip off while delivering a luxurious hotel-like sleep experience. The bamboo fabric’s natural softness and cooling properties make it excellent for sensitive skin and warm sleepers.
King Fitted Sheet Deep Pocket – Extra Deep 17″-21″

The DeaLuxe King Fitted Sheet is perfect for mattresses ranging from 16 to 21 inches deep, providing a precise and secure fit especially for pillow top mattresses or foam mattress toppers. Its microfiber fabric is notably soft, engineered to feel like a gentle caress, enhancing sleep comfort without overheating.
Reinforced elastic on the fitted sheet ensures the sheet stays tight and secure throughout the night. This single fitted sheet option is an excellent choice for those who already have flat sheets and pillowcases or prefer adding custom bedding elements while accommodating thick mattresses seamlessly.
Mellanni King Sheets Set – 4 PC Iconic Collection Bedding

The Mellanni 4-Piece King Sheet Set is designed for a comfortable fit on mattresses up to 16 inches thick. Crafted from double-brushed microfiber, these sheets offer a soft, ultra-light feel that enhances breathability, moisture-wicking, and quick-drying capabilities.
This set includes one fitted sheet, flat sheet, and two pillowcases. It is wrinkle, fade, and stain-resistant, standing up well to frequent washing. Though the deep pocket fit maxes at 16 inches, the sheet’s elasticity provides some flexibility for slightly thicker mattresses. The cooling fabric is ideal for year-round use, promoting temperature regulation.
ELEMUSE King Mattress Topper for Back Pain, Extra Thick Mattress Pad

The ELEMUSE King Mattress Topper combines extra thick cushioning with deep elastic pockets to fit mattresses between 8 and 21 inches deep. It features overfilled down alternative filling that offers plush support and pressure relief for hips, shoulders, back, and knees. The topper retains less body heat than memory foam, making it less likely to cause overheating at night.
The box sewing pattern keeps the filling evenly distributed, and the elasticized deep pockets ensure the topper stays in place despite frequent movement. This mattress pad also contributes to improving overall sleep quality by adding softness and support to firm or uneven mattress surfaces.
Buying Guide for King Sheets on Thick Mattresses
When shopping for sheets to fit thick mattresses, consider the following important factors to ensure comfort, functionality, and durability:
- Deep Pocket Size: Measure your mattress thickness accurately and choose sheets with pockets that fit comfortably over the mattress plus any toppers. Look for pocket depths matching or exceeding mattress height, ideally around 18 to 24 inches for extra thick beds.
- Material: Softness, breathability, and durability depend on the fabric. Microfiber is soft, affordable and wrinkle-resistant but may retain heat. Bamboo viscose brings natural cooling and moisture-wicking benefits with a silky feel. Cotton offers durability but check thread count for softness and breathability.
- Elastic Quality: Elastic sewn around fitted sheet edges should be strong and stretchy to hug mattress edges securely without loosening. This prevents sheets from slipping off during the night.
- Care Instructions: Easy-care sheets that resist fading, shrinking, and wrinkle formation save time and maintain appearance with frequent washing. Machine washable and quick-drying options are convenient.
- Additional Features: Some sets include pillowcases with closures or decorative embroidery for aesthetics. Mattress toppers with deep pockets add cushioning and relief from pressure points specially designed for thick mattress surfaces.
- Temperature Regulation: If you tend to sleep hot, opt for breathable, moisture-wicking materials like bamboo viscose or cotton blends that promote airflow and help keep your skin dry.
By considering these perspectives, you can select sheets and mattress toppers tailored to the thickness of your mattress while enhancing sleep comfort every night.