This overshoe is the middle member of the dhb overshoe family providing protection against cold wet weather the 3mm neoprene is tough but stretchy when applied over the shoe the fitting is snug and form fitting the durable rear entry size 5 lock down ykk zip gives access to the shoecover once the foot is in place and the heel adjusted it can be zipped closed and further secured with the velcro top tab neoprene is made from closed cell foam trapping thousands of bubbles of insulating ga