Monofin - mono fin 1970, Free diving RARE This is a very rare and never offered piece of vintage sports equipment but it is also to be seen as a great decorative item with a beautiful unique shape Mono fin marked "the Ultimate fin" registered trademark 1970's These fin's were used in Free diving. Freediving, free-diving, free diving, breath-hold diving, or skin diving is a mode of underwater diving that relies on breath-holding (apnea) until resurfacing rather than the use of breathing apparatus such as scuba gear. Besides the limit of breath-hold, immersion in water and exposure to high ambient pressure also have physiological effects that limit the depths and duration possible in freediving. The history of the mono fin can be found on the internet the fin itself is made of laminated fibreglass and rubber 70 cm wide en total height 72 cm Great decorative item. Will be carefully packed and shipped. We use recycled materials as packaging to reduce waste. Shipments for multiple items can be combined if the shape is similar, please pay and we will recalculate the shipping cost. Excess shipping payment will be returned to your bank account