Firefly
DealPortable athlete recovery device
Best known from its Shark Tank appearance, Firefly is a portable athlete recovery device in Season 16, and convinced Lori Greiner and Rashaun Williams to invest.
As an Amazon Associate, Shark Tank Index earns from qualifying purchases.
Affiliate link — we may earn a commission at no extra cost to you.
Availability shifts constantly for Tank alumni products. Tap through to see Firefly's current price and stock on Amazon.
From the show
The Shark Tank pitch
- $500K
- Asked for
- 2.5%
- Offered equity
- $20M
- Sought valuation
- $500K
- Deal amount
- 5%
- Deal equity
- $10M
- Deal valuation
Anthony KJenstad and Lauren Campbell walked into the Tank in Season 16, Episode 14 in the episode that aired March 21, 2025. Firefly, the portable athlete recovery device, pitched in the Sports & Outdoors category, one of 154 sports & outdoors businesses to brave the Tank across all 17 seasons.
On the carpet, the number was $500,000 for a 2.5% stake, which valued the company at $20M.
Lori Greiner and Rashaun Williams teamed up at $500,000 for 5% equity. That priced the company at $10M, a haircut from the $20M the founders walked in asking for, which is how negotiations in the Tank usually go.
Firefly was one of 64 businesses to pitch in Season 16, where 45 deals got done. In the Sports & Outdoors category overall, roughly 64% of pitches have landed a shark across the show's history.
The full story
Everything to know about Firefly
Firefly is a small, wearable recovery device that clips just below the knee and sends gentle electrical pulses to the peroneal nerve, creating a light muscle flutter that boosts blood circulation. The goal is to speed muscle recovery and ease soreness while letting you stay active and mobile, unlike bulky boots or machines you have to sit beside. The company is led by Anthony Kjenstad and Lauren Campbell, who brought the medical-grade technology into the sports and fitness world.
On Shark Tank Season 16, the Firefly team asked for $500,000 for a slim 2.5 percent stake, a high valuation that reflected confidence in the technology and its traction. After discussion, they landed a deal with Lori Greiner and guest shark Rashaun Williams for $500,000 in exchange for 5 percent. The negotiation centered on growth: the device already had a foothold with athletes, and the sharks saw a path to scale it.
Firefly stood out because it offered real, clinically grounded recovery science in a package small enough to wear on a flight or between training sessions. The pitch leaned on credibility with serious athletes rather than hype, and the involvement of high-level sports figures reinforced that this was a tool teams actually use, not just a consumer gadget chasing a trend.
Where Firefly is now
The Shark Tank appearance raised Firefly's profile with everyday athletes and fitness buyers beyond the professional teams that already used it. The exposure added to existing momentum and helped position the brand as a portable alternative to heavier recovery equipment, broadening its audience among runners, lifters, and weekend competitors.
As of 2026 Firefly Recovery is still operating and has deepened its ties to elite sport, including partnerships with national governing bodies and use across a large number of professional and collegiate programs. The company continues to sell its portable recovery devices and accessories directly while expanding its reach in the team and travel-recovery markets.
Where to buy Firefly
You can buy Firefly directly from the official site at fireflyrecovery.com (also reachable via recoveryfirefly.com), where starter packs and bulk team options are sold, and listings also appear on Amazon. A pack includes the wearable devices and straps so you can use them at home, at the gym, or while traveling. For athletes who train hard or sit for long travel days, it is a credible recovery tool, though it is priced above simple massage gadgets.
Sold on Firefly?
Check today's price and availability before it swims away.
Affiliate link — we may earn a commission at no extra cost to you.
Frequently asked questions
Where can I buy Firefly?
Check current price and availability on Amazon. Note that some Shark Tank products are discontinued or sold under a new name. The company's official website is another option.
Did Firefly get a deal on Shark Tank?
Yes. Firefly closed a deal for $500,000 in exchange for 5% equity, with Lori Greiner and Rashaun Williams.
Which shark invested in Firefly?
Lori Greiner and Rashaun Williams invested in Firefly ($500,000 total as aired).
What season of Shark Tank was Firefly on?
Firefly appeared in Season 16, Episode 14, which aired March 21, 2025.
How much was Firefly asking for on Shark Tank?
The founders asked for $500,000 for 2.5% of the company, a $20M valuation.
How does the Firefly recovery device work?
It uses gentle electrical stimulation of the peroneal nerve to create small muscle contractions that increase blood flow. This is meant to reduce soreness and speed recovery while you stay mobile, rather than sitting in a recovery boot.
What deal did Firefly get on Shark Tank?
Lori Greiner and guest shark Rashaun Williams invested $500,000 for 5 percent equity. The founders had originally asked for $500,000 for 2.5 percent.
Is Firefly still in business in 2026?
Yes. Firefly Recovery continues to operate and sell its portable devices, and has built partnerships with major sports organizations and many professional and college teams.
Shark Tank Index may earn a commission on purchases made through links on this page. Deal figures reflect what aired; terms sometimes change after the show.
