The Pathos Fireblade freediving fin foot pockets, made up of 3 different compounds of vulcanized rubber, offers exceptional comfort combined with a lightness great (only 13 oz) in comparison to any shoe competitors. The spars are very thin to work well the blade, making them form almost a U-turn and then not too much strain on the leg, but at the same time have an excellent boost both in depth and on the surface on th