The SILENCR(TM) AKTIV 5 PANEL HAT is one size fits all and loaded with features to help you stay active. Laser-cut mesh panels provide ample airflow while a water-repellant finish and superior sun protection (UPF 50) keep the elements out. The soft foam brim won&';t distort and allows for easy packing. KUHL&';s durable stretch fabric paired with a back-strap adjustment ensures a comfortable, customized fit. DIFFERENT BY DESIGN. DIFFERENT BY CONSTRUCTION.(TM) Laser cut mesh panels provide ample airflow 4-way mechanical stretch polyester fabric with DWR Soft foam brim doesn&';t distort when packed down UPF 50 Imported Durable 2-way stretch fabric has great hand feel and dries quickly with PFC Free DWR One handed quick adjust strap system Multi panel anatomically correct fit One size fits all