Aqua Lung Stratos ADJ Diving Fin The new Stratos ADJ provides a slightly softer kick than the Express ADJ. It is a durable fin that lends itself well to rental lockers, instructional use and resort settings. This fin offers much technology at an affordable price making it a great value! The dual-material foot pocket offers a Power Transmission Zone to prevent stretching. This provides maximum energy transfer from diver to fin Dual-material side ribs and blade The Bending Zone between the blade and foot pocket allows the blade to quickly reach the optimal inclination for propulsion and water channeling Quick release buckles Ergonomic strap Sizes: Small, Regular, Lg/XL