It provides a soft and comfortable feeling as you are wearing your fins, it has a cushion pads which is the main reason of that fluffiness. Even if the fins are worn without any protective socks, using the barefoot, there will be no problem at all since the cushion will protect your feet by offering its soft cushion.

Comfort Insteps are 3/8"" thick, Force Fins are suggested to size up from your barefoot shoe size. A various model of Comfort Instep is included with configurable designed Force Fins.