This skull cap is ideal for wear during the coldest weather. Microfleece is densely constructed to keep out wind and wet. The low profile design fits most head shapes comfortably, while providing some degree of "give" when worn under today's full face helmet styles. The neoprene ear region keeps the skull cap in place and will not shift around under helmet. The nylon binding around ear area provides a clean, tailored look, and prevents fraying of fabric.