Open Box Cressi Atom Frameless Freediving Mask Green Black Scuba Roller Bags low frequency kick cycle Made Skins and Rash Guards low frequency kick cycle Made from a soft high performance thermoplastic rubber material This unique material enables divers to experience the same performance as the standard Atomic Split Fins while requiring even less physical effort Semi rigid battens set in the soft elastomeric blade controls the precise wing shape to optimize thrust and reduce drag The split blade deflects with the slightest kick to form a pair of wings that slice through the water with reduced drag The Comfort Swivel offers a more Comfortable Fit since it creates no load on the mouthpiece giving just the right rigidity to the mask This semi rigid core substitutes the usual external plastic frame and allowed us to reduce the internal volume of the mask in an unseen way until today