Underwater Thruster

Underwater Swim Boosters & Electric Fins | Flathead Valley Rentals

“Because legs are great... but batteries are better.”

Feel like a mermaid with turbo mode. Our underwater swim boosters give you the power to glide farther, faster, and with way less flailing. Whether you’re snorkeling across a crystal-clear bay, exploring your lakefront, or just racing the kids (and winning), these compact electric fins add effortless propulsion to your paddleboard, kayak—or straight-up body.

What’s in the lineup?

  • Electric Power Fin Kits for iSUPs, kayaks, and swimmers
  • Wearable underwater boosters with swim harness attachments
  • Rechargeable, compact, and beginner-friendly

Great for low-impact fitness, exploration, or helping tired paddlers finish the lap back to the dock (no shame). Our kits are lightweight, easy to use, and surprisingly addictive.

Where do we deliver? Anywhere across the Flathead Valley—including Flathead Lake, Whitefish, Echo, Swan, or even that secret swimming hole only locals know.

Want to own one? Use your exclusive renter discount at

Underwater electric power fin boosting a swimmer across Flathead Lake. Compatible with paddleboards, kayaks, and swim harness kits. Rent from MontanaBoarders.com or buy at E-Boarders.com.