Nike's Alphafly 4 sold out quickly, showing strong demand for super shoes. Despite no groundbreaking features, the shoe sold out before its official launch.

The Alphafly 4 is an evolution of its predecessor, featuring lighter components and improved energy return. Nike claims it is five percent lighter and has 10 percent more energy return. Read more gear coverage.

The sellout reflects Nike's strong market position in running shoes, despite overall business challenges. The brand continues to lead in innovation and consumer demand. Related: Nike Alphafly 4 Launches with Major Upgrades.

This original Runner World brief is based on reporting from Canadian Running. Visit the source for its complete reporting, context and any later corrections.