Pearl Izumi Running Shoes are a niche running shoe with a smaller market share but still very popular with a loyal group of runners that use them.

Curated Resources:
http://podiapaedia.org/wiki/sports-medicine/individual-sports/running/running-shoes/pearl-izumi/ (PodiaPaedia)
http://www.podiatryonline.tv/pearl-izumi-running-shoes.htm (Podiatry TV)
http://www.shopping-emporium.net/sport/running/running-shoes/pearl-izumi-running-shoes/ (Shopping Emporium)