Women's sports merchandise is an estimated $4 billion industry. So who's going to step up to the plate?

iStock; Rebecca Zisser/BI

• The women's sports merch industry is worth an estimated $4 billion annually, per a new report.
• But fans have complained about a lack of retailers, minimal options, and low inventory.
• Small companies are stepping up, but questions remain over how bigger brands will meet fans' demand.

As a two-time All-American, two-time World Cup winner, and National Women's Soccer League champion, Ali Krieger has had many unforgettable experiences throughout her career.