This monofin is new version of merman’s leading custom made Tiun. Our monofin is one of the most advanced monofins in the world and the new shape of the blade makes it even more responsive. Great for depth, underwater swimming and competitive freediving and finswimming. Professional merman monofin comes with hand-made, new shape fishtail blade. It has revolutionary cast rubber foot pockets that enable optimal grip of the freedivers feet and the best possible energy transfer. The monofin is also great for finsimming immersion distances.