Comfort is key in sleepwear, so it's no surprise that knit sleepwear is very popular. Although wovens have their place, knits stretch more and therefore don't bind you or wake you when you move at night. Cotton is one of the most comfortable of knits, especially when knit with spandex for maximum stretch. Modal knit has grown in popularity in recent years, mostly due to its ultra-soft touch. Made of fibers from the beechwood tree, modal is a natural for sleep separates. And rayon also takes high marks for absorbing colors beautifully, providing sleepwear in exquisitely detailed patterns. Polyester fleece also provides warmth and comfort in knit sleep tops and bottoms. Most if not all of HerRoom's famous maker sleepwear includes knit separates in their collections for your wearing comfort and pleasure.