Both our SleepLikeABear Pure 100% Organic Knit Cotton Zipper Cover and SleepLikeABear All-Natural Knit Bamboo and Cotton Zipper Cover are sewn in the USA with the same high-quality standards using American made fabrics. The primary difference lies in the fabric composition: one is made entirely of GOTS-certified organic cotton, while the other is a blend of approximately 40% bamboo viscose and 60% cotton.

In terms of feel, the cotton cover has a denser texture, while the bamboo blend feels silkier. Both materials are luxuriously soft and breathable, but they perform slightly differently in various climates. The 100% cotton is more absorbent, which can be beneficial in drier climates. In contrast, the bamboo/cotton blend is preferred in more humid conditions or by those who sweat more, as it tends to stay cooler and less clammy. Neither fabric adds extra heat to the body, unlike some synthetic materials.

Will your unquilted zippered encasements firm up the mattress by any significant amount?

Our covers are designed to add minimal firmness to your mattress. They are made from soft, medium to heavy-weight fabrics (310 GSM and 285 GSM) that provide durability without significantly altering the feel of the mattress components. When installed, the zip covers serve as an additional comfort layer, thanks to their soft knit fabrics and knife-edge, waterfall construction, which allows for natural stretch and movement with your body.