Plunge

When COVID-19 shut down their float therapy and sauna businesses in 2020, Ryan Duey and his partner Michael faced a choice: pivot or perish. They noticed something consistent across both their brick-and-mortar locations—customers kept asking about cold plunges. The market solution existed: plunges cost around $15,000, making them inaccessible for most people. The founders saw an opportunity to democratize cold plunging by building an affordable version from Home Depot parts and basic engineering.

Duey and his partner assembled their first cold plunges from off-the-shelf materials. The DIY nature of the early product was evident—they looked homemade because they were. But they worked, and more importantly, they were a fraction of the existing price. Rather than taking the traditional route of raising capital or iterating in stealth, they decided to test the market immediately.

Instead of spending on ads, they leveraged influencers. They reached out to Aubrey Marcus, an Instagram-famous health personality and founder of Onnit, with a bold proposition: "We'll bring a cold plunge to your house for free and set it up." They loaded up a U-Haul with five units and showed up at his place. Marcus loved it and connected them to Andrew Huberman, the Stanford neuroscientist whose podcast was beginning to explode. Huberman got one for free and started endorsing cold plunging to his growing audience. This created a compounding effect—influencers and their followers saw Plunge units appearing in the homes of people they admired, which created the perception of a thriving, exclusive brand. The company has given away over 1,000 units as part of this strategy.

Plunge's growth trajectory is remarkable: $270k in 2020, $8M in 2021, $33M in 2022, and on pace for over $120M in 2023 (roughly $10M/month). The company is profitable and bootstrapped—they've taken zero outside funding. What made the difference was paid advertising efficiency. Ryan hired someone on Upwork to manage their Google and Facebook ad spend, and the numbers are extraordinary: a recent month showed $860k in ad spend generating a 7.1x return on ad spend (ROAS). Google Ads delivered 5.8x ROAS, while Facebook delivered 10.7x. On Facebook, their cost to acquire a customer is approximately $387, while their product sells for $5,500—a nearly 14:1 ratio. This advertising efficiency, combined with organic word-of-mouth, created a self-reinforcing growth engine. The company also acquired the domain plunge.com from a New Orleans jazz band for $250k, giving them a premium web presence.

In four years, Plunge went from a COVID pivot to a $120M+ revenue business without external funding. They've expanded beyond cold plunges into complementary wellness products like saunas. The company serves as a case study in influencer-driven growth, the power of gifting to build perception, and highly efficient performance marketing. While the science of cold plunging remains debated, the business impact is undeniable—and Duey and his partner have built a playbook that many e-commerce founders are now studying.