The goal of our Tec-Wool hat is nothing less than consistent comfort. It is based on c_change™ technology, which reacts independently to temperature fluctuations. A superb 3-season hat! Our Tec-Wool hat uses a c_change™ membrane to guarantee constant comfort. What is c_change® technology? Just like a pine cone, the c_change® membrane opens when the outside temperature increases and closes when the temperature drops. Enjoy the following benefits: Constant comfort: c_change™ maintains a stable temperature Keep warm: discreet retractable ear cups for use in cold weather Keep dry: fabric resists rain and snow Other features: Lifetime warranty Hydrofil headband ® moisture-wicking Secret pocket to keep valuables safe Made in Canada Brim: Front: 2 5/8 in; rear: 2 ¾ in; sides: 2 in 1/8 Weight: 136 g / 4.8 oz Fabric: Black: 71% wool; 18% polyester; 11% polyurethane Care: Dry clean only.