A snug and streamlined full head cover with a wind resistant front panel to keep you cozy in the thick of winter. Precisely tailored to fit under a helmet, the Barrier Skull Caps mildly scalloped back prevents fabric bunching while in the cycling position. P.R.O. Thermal Dry fabric provides quick-drying warmth, reflective elements enhance safety, and an otherwise hidden rear port opens as needed to accommodate a ponytailPRO Barrier fabric panel on forehead provide lightweight wind protection and water resistance,PRO Thermal Dry fabric provides optimal moisture transfer, dry time and odor absorption with warmth,Ergonomic cut layers easily under helmet,Low profile ponytail port allows for long hair and does not interfere with helmet retention mechanisms,Reflective elements for low light visibility,One size fits all,Weather forecast: Cold and windy,Temperature range: -5 to 5 degrees,Fabrics: Barrier Front Panel of 100% polyester and Thermal body of 90% polyester 10% elastane.