Chaos Headwall Chimney Balaclava. The Chaos Headwall Chimney balaclava is the ultimate winter weather protection designed to be worn with a Bicycle Helmet. It features a Polyester shell material that is coated with a very waterproof DWR treatment. It's also insulated with 70 grams of Thinsulate and a soft, high pile fleece lining to keep you warm and dry in all conditions. The top of the balaclava is made from lightweight and warm Chaos Pro Stretch Fleece, and the flat lock seams on top are comfortable when worn with a Bicycle Helmet. The front of the balaclava features windproof and waterproof material with ventilated panels and mesh lining for maximum breathability. Adjustable side panels always make for a secure and snug fit. The Chaos Headwall Chimney balaclava provides comfort, warmth, and dryness for bike riders who don't let the weather get in their way.