Synergy: A Veritable Distillation Of Technologies. A Hybrid Shell Allows For Maximum Resistance And Lightness, And An Air Extractor And Adjustable Ventilation Keep Your Head Dry And At Just The Right Temperature.Features:- Air Extractor- Adjustable Ventilation- Click-To-Fit™ System- Removable Ear Pads- Audio Kit Compatible- Hybrid Shell- Furry Lining- Removable And Washable LiningSpecifications:- Weight: 490g