Most fitted sheets use elasticized bottoms—described as fully elastic, all-around elastic, or reinforced elastic bands—to keep the sheet snug on the mattress.
Listings describe sheets for bassinet mattresses, mini cribs, pack n play/playards, and portable cribs (including changing pads). Note that some bassinet sheets are smaller than crib sizes and may not fit standard cribs.
Care instructions commonly recommend machine washing and tumble drying. Several listings specify machine wash cold and tumble dry low.
Many listings are sold as two-pack sets, though at least one listing shows a single-sheet package—check the product details before buying.
Check your mattress depth against listed pocket depths—common listings mention a 5-inch pocket and maximum mattress depths ranging from about 4 to 8 inches.
Descriptions and reviews commonly call these sheets soft—often “t-shirt” or “buttery” soft—lightweight, breathable, and reported to stay soft after washing.