This is the IST Fathom Blue Apnea Free Diving Spearfishing Fins with Flexible Blade and Full Foot Pocket Features: Fathom Blue is a purpose-built apnea diving fin (free diving / spear fishing). The comfortable foot pocket and power ful blade provide efficient thrust and unparalleled underwater maneuverability. Furthermore, there are two blades with different flexibility available to suit different divers' preferences and requirements Although more expensive, rubber is our chosen material to make Fathom Blue's foot pocket . It might seem a bit old fashioned but at the end of the day, it is all about performance. We were able to strategically build a rubber foot pocket with multiple flexibility / hardness while fins made from various plastic compounds do not share the same advantage. This means Fathom Blue's foot pocket is able to produce a spring-like effect when finning, yet its base (sole) is rigid and efficient The BTA0150 boots are like neoprene socks with ultra thin rubber soles. This gives spearfishermen the protection needed for walking while foot pocket fitting is not hugely affected Blade dimension - effective (H × W): 22cm × 60cm (8.5 × 24") Overall length: 92cm / 36" (size XL) Weight (pair, land): 3kg / 6.6 lb (size XL) Blade: The gray blade is more flexible and less demanding, thus enabling the diver to flip through water quickly.(see Product#fin76 for the Stiffer Blade Option) Time tested technology in a sleek and modern design to provide free divers and spear fishers the ultimate in comfort and reliability. S/M (Men's Size 8 - 9)M/L (Men's Size 10 - 11)L/XL (Men's Size 12 - 13)
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