Under Armour HOVR Sonic 3 w/ built in Bluetooth is almost as light as a tempo shoe, so more flexibility. Bluetooth, allows you to connect the shoes to the Under Armour app MapMyRun,The HOVR Sonic 3 is for the runner, who needs more flexibility, shock absorption, and versatility. HOVR Sonic 3 product overview- Neutral running style-Fast everyday training shoe- A lot of flexibility -Built-in Bluetooth The upper is made from a nice and porous mesh material,allows your feet to breathe when you run and designed to make it firm and stabilising around the midfoot while being bouncier at the toes. Midsole Under the slogan ”Gravity holds you down HOVR lifts you up”, HOVR running shoe with the unique HOVR material at midsole. Under Armour claims this gives a feeling of “Zero Gravity” so, you will feel like you are hovering. The Under Armour HOVR-foam material that efficiently reverts back to its original shape when it gets compressed -it has a great “return of energy” so, a lot of the energy that is being pushed down into the shoe is given back to the runner. To enhance this effect, even more, the HOVR material is packed in a so-called Energy Web –a powerful weave of tiny thin threads (you can see it at the back of the heel and through the shoe’s “window”on the outside of the shoe.)The shoe’s outsole is made with a durable rubber material, which increases the durability and provides a great grip with the surface. Please see pics they are used in great shape. Lt lace needs replaced.