Sizes vary by listing: some items are offered from XS–3X, while the solid ribbed styles are described as available from S–3X.
Listings describe pull-on styles with elastic waistbands. Many mention a functional drawstring combined with elastic or a full elastic waistband for fit.
The listings describe a regular or standard fit, and some items are labeled as jogger-style sleeping pants.
The available product details list the solid ribbed pajama bottoms with no pockets.
They are described generically as 'Knit' and more specifically as 'jersey knit ribbed fabric' in the product details.