Many knit neck gaiters use acrylic knit; some multi‑use gaiters and balaclavas are made from merino wool blends often combined with nylon and spandex for stretch and durability.
Care varies by fabric: many acrylic knits note machine wash and either tumble dry or line dry. Merino blends typically recommend machine wash cold on a gentle cycle and low‑heat tumble dry or line dry.
Coverage depends on the style: basic knit gaiters typically cover the neck, ears, and lower face, while balaclava‑style or pull‑up gaiters can also cover the nose, mouth and cheeks and may provide full head coverage.
Most knit gaiters are pull‑on styles that you slide up or down to adjust coverage. A few listings also note features such as an adjustable strap or toggles for a more secure fit.