Drake Waterfowl Systems Mid Season Technology (MST) Waterfowl Fleece-lined Pullover features Refuge HS with HyperShield Technology. Refuge HS (Hard Shell) is another innovative material brought to you by Drake. Combining the toughest and strongest fibers available enables this material to stand up against all of the elements a hunter faces with very little maintenance. 100% waterproof, windproof and breathable, HyperShield is an impenetrable membrane that will shield you from the elements. Also features taped seams, neoprene cuffs, magnetic chest call pouch, license/key pouch, call separator, deep water handwarmer pockets, and easy on-off side zips.