A whopping two-thirds of Touch of Modern's business comes from mobile, echoing a broader shift toward it in the retail industry.
Now is a great time for entrepreneurs to experiment with mobile marketing, Hum said.
"The great thing about a time like now is that the user experience models in mobile aren't that well established. You can still be creative and come up with new experiences," he said.
Men are shopping online more than ever before. Though women still shop online more than men, men are more likely to shop on their phone—a trend Hum is betting will continue.
"When you hit something successful, you definitely know it. It's not like 'Oh, we're not really sure about this, maybe it's just hard and a struggle to scrape by.' You try different things, but when you hit it, you know it," he said.