This collaboration beanie features a distinctive embroidered Western Hydrodynamic Research logo across the front panel in bright green lettering. Constructed from 100% nylon for durability and moisture resistance, it includes an innovative shock cord bungee closure system with multi-stranded rubber core encased in nylon and secured by brass grommets to prevent pull-outs. Designed and tested in California by the WHR Institute with U.S. Patent protection.