Louis Garneau - Cycling Hat Cover 2 Polyester Imported The Hat Cover 2 is a snug-fitting hat that can be worn with or without a helmet The Enerblock fabric is insulating, waterproof, and wind breaking. The 4-way stretch knit fabric is comfortable to wear. Reflective accents provide extra visibility in low light. The Hat Cover 2 is a must-have accessory for cold weather riding.