Scubapro Base Boot 5mm - Black Built-in arch support increases comfort when traversing rocky shorelines The reinforced toe and heel caps extend boot life. The heel cap includes a molded fin strap keeper The long zipper is great for easy donning and doffing and is fitted with a gusset to cut down on water seepage. Velcro zipper-end patch secures the side zipper when closed. For detailed size information, please refer to Scubapro Boot/Sock Sizing Guide.