A signature 5.11 Tactical boot steps it up in functionality and comfort. Built for all day comfort, the Halcyon Waterproof 6â Boot features our Maximus CMEVA midsole and Ortholite X-40 high-rebound foot bed. Need more assurance? 5.11âs Slipstream waterproof membrane is blood borne pathogen resistant, with a low friction odor-control lining to reduce heat and blistering. And the new Tac-lock laces stay put until you untie them. Gear up, itâs go time.