BW Unisex Cotton Sleep Cap Cancer Patients Chemo Beanie Hat 100% Cotton 100% Cotton fabric offers all day comfort, full coverage and greatstyle. Adjustable Head Circumference fit well for most:21"-25"54-62cm,Hat Deep:7.5"/ 19cm Thin and breathable,Suit for spring and summer. A great item for sleeping ,chemo /hair loss patients,rideing,etc.