A warm hat to wear under a bike or ski helmet. Made entirely of flexible softshell fabric, it is windproof and insulated with fleece on the inside. It has flat seams and provides excellent ear coverage. -insulated with fleece from the bottom -windproof - flexible Softshell -flat seams -contoured for the ears -perfect for a bicycle or ski helmet -universal size -100% polyester, hand wash at 30 degrees, do not spin. Hat width ~ 27 cm - before stretching Hat height ~21 cm