Our best selling warm winter hat. We do that by using c_change™ technology which independently reacts to changing temperatures. This is a great 3 seasons hat! Our Tec-Wool hat uses c_change™ by Schoeller® Switzerland technology membrane to ensure constant comfort. What is c_change® technology? Much like a pinecone, the c_change™ technology membrane opens when the outside temperature rises, and close again when the temperature drops.Features: Constant comfort – c_change™ works to maintain an even temperature Keeping warm – discreet tuck away ear warmers can be pulled down in cool weather Staying dry – fabric repels both rain & snow Guaranteed for life Hydrofil® sweatband to wick moisture away Keep valuables safe in the secret pocket Brim size: Front: 2 5/8"; Back: 2 3/4"; Sides: 2 1/8"Weight: 4.8 oz / 136 gManufacturing: Made in CanadaFabric: Black: 71% Wool, 18% Polyester, 11% Polyurethane and Grey, Olive & Rust: 88% Wool, 12% PolyurethaneCare: Dry Clean Only