Mystic Marshall Split Toe 3mm Neoprene Bootie 

What HKC has to Say: 

Nice warm booties that make your feet feel like a ninja. Great bootie option for watersports!

What Mystic says:

We've got your feet covered with the Marshall Split-toe 3mm shoe. It offers you the same features as the Marshall boot, but with extra flexibility around the ankle. Change the tightness to your liking with the heel loop integrated ankle adjuster for optimal fit.