Constant comfort is the aim of our Tec-Wool 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. Look forward to: Constant comfort – 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 Additional Features: Guaranteed for LIFE!! Internal size adjustment device Hydrofil® sweatband to wick moisture away Keep valuables safe in the secret pocket Made in Canada Brim size: Front: 2 5/8"; Back: 2 3/4"; Sides: 2 1/8" Weight: 4.8 oz / 136 g Fabric: Black: 71% wool; 18% polyester; 12% polyurethane; Grey/black herringbone & Blue/black herringbone: 88% wool;12% polyurethane Care: Dry Clean Only