The Seirus Dynamax Skull Liner works perfectly under a helmet for snowy, winter bike commutes or extra warmth at the hill. The Thermax microfleece is thin, warm, wicking, wind-blocking and stretchy.

• Dynamax dual density micro-denier Thermax fabric
• Fabric: THERMAX polyester
• Moisture wicking and wind-resistant
• Thin, warm, wicking, wind-blocking, stretchy
• Thin stretch construction