Bamboo rayon is our fabric of choice for chemo caps and cancer headwear. Our royal blue signature bamboo sleep cap for chemo patients is heavenly soft and comforting on tender heads Our bamboo sleep cap for women wicks moisture to keep you cool and comfortable during warm weather and hot flashes. Allows your scalp to breathe and will not build up heat A soft and comfy sleeping cap is essential for your chemo headwear wardrobe. Even in the summer you’ll want to wear something soft and soothing on your head during the night Weighing just one ounce, our lightweight night cap chemo beanie is nice and roomy with plenty of stretch for women with large heads. Gentle covered elastic at the neckline. 95% bamboo rayon, 5% spandex. Fits head sizes 21 to 24 as measured around the hair line. Hand wash, gentle. Air dry. Hand crafted in Bali exclusively for Hats, Scarves & More.