Sure, La Sportiva's Helios 2. 0 Trail Running Shoe would be lighter than air if it were actually made from helium, but your feet might feel pretty kicked after an 18 mile trail run in them. Not to mention, you might have a hard time finding them before you head out for a run. For that, and a few more, reasons, it's probably best that La Sportiva built the Helios 2. 0 the way that it did, which is actually pretty damn light. Weighing just eight ounces per shoe, the Helios 2. 0 is made with a super light HyDrain mesh upper, TPU lacing harness, and microfiber heel and toe for extra support and increased durability. The heel of the Helios is lined with a moisture wicking EVA AirMesh for added comfort, while the shoe's MorphoDynamic Midsole ensures a springy feel right out of the box. The Helios 2. 0 maintains the same minimal 4mm drop as its predecessor, but is now equipped with a fast lacing drawcord closure for a quick and secure closure to the shoe.