Sidi fusion air vs cobra air AMX stock all the leading brands like Fox, Thor, Dainese, Arai, Shoei, Oneal, M2R and so much more. Landing between the Sidi Vertigo Boots and Sidi Vortice Boots in the Sidi food chain of race functionality, the STs are a great choice for SIDI MOTORCYCLE & MOTOCROSS BOOTS, SHOES & REPLACEMENT PARTS Sidi Sport was founded over 40 years ago by sports footwear icon, Dino Signori. I would recommend the Cobra over the Fusion. 2. I've looked at both of these models and they seem fairly close but dont know which Nov 18, 2010 ยท November 18, 2010 – Sidi announced six new boots for 2011, including the Sidi “Fusion Air” boots that look like they should be very cool, in more ways than one! The retail price of these boots is $200. The top-of-the-line boot is still the Vortice at $495. Sidi Sport has a legacy which spans over 40 years and Sidi Boots are some of the most sought after and most protective boots on the market. A brand that also rarely goes on sale and only occasionally has a closeout, for the price savvy customer, a good closeout is hard to find. Throw in some cushy insoles & you're good. They only have about 100 miles on them now.