Mike Stewart introduces the Gyroll/Viper fin Insert: The first fully padded foot-pocket that is attached to the fin. You no longer have to feel awkward riding with a bulky bootie or sock, as the entire foot pocket is padded within the fin.
Viper inserts are 2mm fin socks with a fin heel pad in one. The sock is attached to the fin by a Velcro pad that wraps around the heel of your fin to give your feet comfort and protection. Viper/Gyroll inserts are completely removable /changeable, with sizes to fit a wide variety of open heel fins. They are vented to drain sand and also work with the Gyroll connector fin savers.
Viper Inserts differ from the Gyroll Inserts becuase they are specifically designed for the MSVipers and have an additional locking mechanism to secure them in place.