Performance five-panel hat with a classic look and comfort stretch. The Calidum is a little different. We took the classic five-panel design, then made it with the same performance structured mesh we use in our Konseal climbing harness. The result's a durable, breathable cap that works anywhere – pushing it on the trail, hanging out at camp, and resupplying in town. The material's stretch forms to fit, and the back secures with a TPU strap and buckle. Full Product Features Technical Features - Breathable - Durable Accessory Features - Five-panel construction - Adjustable buckle closure for a secure fit Logos & Label Configuration - Arc'teryx bird logo centre front Sustainability - Contains materials that meet the bluesign® criteria Materials - French Regulation: AGEC Law - Article 13 - Origin of fabric: TAIWAN - Origin of dying: TAIWAN - May release plastic microfibres into the environment when washing