The big dog of Nike running/racing shoes also known as a “super shoe” with carbon plates. I bought these for just one race and only have 40 miles on them. I’ve owned them for about 6 weeks total. They have been authenticated. Bought them brand new for $260 from a Nike online retail store. The retail on the Alpha 3 is anywhere from $240 to $350. Bouncyest shoes on the market. These shoes are freaky fast. Comes with authentic shoe bag specific to this model. Porch pick up.