"We are a digitally native company, so we've been able to really understand our customers — what they want, where they reside," co-founder and actress Kate Hudson told CNBC. "At a time when people are very nervous about retail, [our customers] still want the retail shopping experience."

The retailer, which has surpassed $300 million in annual revenue, wants to open 75 new stores across the U.S. and overseas, to bring the total to 100. One store, slated to open later this year in Bellevue, Wash., includes a high-tech new-payments processing system. The company’s current store portfolio is registering same-store sales growth of about 20 percent.

El Segundo, Calif.–based Fabletics operates in 10 countries, including the U.S. This fall the company will open its first stores in the Philippines. Additional international stores are in the planning for next year. "We're looking at tier-A malls and lifestyle centers," said Adam Goldenberg, co-CEO of TechStyle Fashion Group, Fabletics' parent company, speaking to CNBC. "France is turning into a good market for us. We were almost too early [in expanding there], but now more and more countries are following suit."