3XDRY Bio is a PFC (perfluorocarbon)-free finishing technology that is based on renewable resources. Mimicking the protective plant cuticle that repels morning dew drops and heavy rain, the 3XDRY Bio outer surface fends off water and dirt so effectively that they simply run off the surface of the fabric, while the interior absorbs moisture and wicks it away. As a result, fabrics with 3XDRY Bio are incredibly quick to dry.Features Include:Stowaway sun shield offers maximum protection for your neck and shouldersSunglasses can be stored at back crown with hook and loop fastener tab to keep them handy when not in useTilley deboss moisture wicking, cooling elastic sweatband that will keep you dry and comfortableReflective wind cord and Tilley embossed logo tab will be seen in low light situationsThick foam in the brim to resist brim flapping in high winds - and the hat will float!Loop at back under brim to easily "tie on" with a carabiner to your belt loop or bagClassic Tilley wind cord system to keep the hat on your head in high winds and rough watersSecret pocket to store your boating license or other valuables