Mares Avanti Tre Full Foot Dive Fins Color:Black It also has twin heading

It also has twin heading indicators for alignment of compass course

OPB for controlling and optimizing the thrust angle

This particular piece by Mares is made of durable rubber and fits a wide variety of strapped open heel fins

Auto Dual EL Backlights with Afterglow

Mares Avanti Tre Full Foot Dive Fins Color:Black It also has twin headingLightweight, efficient and economical Orthopedic foot pocket Rugged, durable construction Good thrust in an economical fin Avanti Tre features a soft anatomical foot pocket, and mid sized blade with three channels for optimal movement of water during the kicking cycle. Perfect for travel to warm water locations. Upper and lower stabilizers help transfer energy from the foot pocket to the blade. Easy to kick for extended snorkeling time.