Here's what other sites are saying:
Tilley Men's Accessories TTW2 Tec-Wool Hat Black 7 10WP00HTTW21372. 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.
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