The Sealskinz Waterproof MTB Bobble Hat is a totally waterproof, windproof & breathable hat in a classic knitted style & comes with a fleece lining for extra warmth, wherever your day takes you. Features Totally waterproof, breathable & windproof Acrylic knitted outer increases durability Micro fleece inner lining provides warmth & moisture control Finished with a pom-pom bobble & a soft & stretchy knitted roll-over cuff for additional comfort Thermal rating guide: 4