SOLY HUXWomen's Button Front Ribbed Knit Tank Top and Shorts Pajama Set Sleepwear Lounge Sets

What is the fiber content? Acrylic? Cotton? Rayon?

The material type says “soft fabric” but it doesn’t actually say what it is made out of. What is the actual fabric?

Are you able to dry these items in a dryer?

Does the elastic waistband feel tight?