Good performance soft silicone material. Extra elasticity and special cut. Hydrodynamic shape. Reusable design. L size, the total width is 18cm, fits for adult man. Swim like a frog. Swim and catch a wave faster. Increase resistance and improve technique. Elastic. Made of silicone. Easy to use & store. These swimming webbed hand will meet the need of swimming beginners. This flippers is easy to fit and 100% brand new. It is a non-oem, generic product. Other product not included.