Most are knit blends. Polyester and cotton are common base fibers, often combined with spandex and nylon for stretch and fit; some listings also include recycled polyester or rubber in the blend.
Many styles offer cushioned footbeds or full-sole padding. Some list thicker or “extreme” cushioned footbeds and added heel-and-toe padding for extra impact protection and comfort.
Many use moisture-wicking fabrics and cooling or temperature-adaptive treatments to move sweat away from the skin and help keep feet cool and dry throughout the day.
Common sizing maps to women's shoe ranges such as 4–10 or 5–9. Some listings offer extended-size options as well (for example, up to 8–12).
Pack counts vary widely. Common options include 10-pair and 6-pair packs; you can also find 4-pair, 3-pair, and single-pair options.