'Feel like butter': This sheet set will rock your world — and they're just $40, today only

One thing we like about the winter months? They're a time to take a look around our home and restock and/or refresh some of the basics — kitchen appliances, towels, furniture...and bedding. It's that last one we want to talk about. Almost all of us are under-supplied in the sheets-and-pillowcases department; it's just something we don't think about that much. But how'd you like to make an ingenious addition to your bed-linen repertoire at a terrific price? Today only, Amazon's got this stellar Luxury Hotel Sheet and Pillowcase Set from California Design Den Store for just $40, down from its usual price of $50.

California Design Den

California Design Den 100% Bamboo Sheets

$40$55Save $15

This set of cooling, breathable sheets comes with one fitted sheet, one flat sheet and two queen pillowcases.

$40 at Amazon

What's so unusual — and inspired — about them? They're rayon, made from bamboo, and will change your sleep experience forever. We know what you're thinking — "Rayon? Isn't that a yucky synthetic? Bamboo? Isn't that a rough, crunchy kind of tree that pandas eat?" Nay, and nay: This rayon is 100 percent natural, plant-based and eco-friendly. And, as it turns out, bamboo-based sheets are softer and silkier than microfiber and even Egyptian cotton.

Most important to many people: These will keep you cool during those winter months when your home heating system's been, um, overachieving, shall we say, not to mention the muckiest of summer nights.

"I have been on a relentless pursuit of finding sheets that stay cool through the night," related one chronically sweltering slumberer. "My room gets super hot and summers have been brutal. I have purchased at least four brands of sheets in the past year that claim they don’t hold heat and they have all been laughable. That’s why these sheets are such a game changer.... These feel like butter and they’re so affordable."

As cool, soft and silky smooth as these are, no wonder they've garnered nearly 5,000 five-star reviews.

"These California Design Bamboo sheets will be the ONLY sheets I have in my home from now on!" said one over-the-moon shopper. "When these sheets arrived I could tell when I took them out of the package they were amazing quality.... I WILL be ordering more sets for the 2 other bedrooms in our home. I am so glad I came across these sheets and the price was amazing!!!"

This set made a believer out of one self-described "bedding fanatic." As she told it: "I am used to high-quality long staple 100% Eqyptian cotton sheets. I wanted to try out bamboo sheets so...I bought this set. Bamboo is different than traditional sheets. Very soft and very silky feeling. Lightweight, but still kept me warm in a California version of a cold room. These sheets are generous in size, fit thick mattress with room to spare. These sheets are well worth the money."

California Design Den

California Design Den 100% Bamboo Sheets

$40$55Save $15

This set of cooling, breathable sheets comes with one fitted sheet, one flat sheet and two queen pillowcases.

$40 at Amazon

If you have Amazon Prime, you’ll get free shipping, of course. Not yet a member? No problem. You can sign up for your free 30-day trial here. (And by the way, those without Prime still get free shipping on orders of $25 or more.)

The reviews quoted above reflect the most recent versions at the time of publication.

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