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SlimeVR has launched its next crowdfunding campaign, this time looking to get backers excited about its next-gen ‘Butterfly’ body trackers, which promise to be thinner, lighter, and offer a longer-lasting battery.

SlimeVR’s crowdfunding campaign for the new Butterfly Trackers quickly crossed its $180,000 funding goal when it went live on February 9th, now sitting at over $347,000 from nearly 760 backers.

Much like the original SlimeVR Full-Body Tracker, which attracted more than $9 million in 2021, the IMU-based body tracking solution lets VR users better articulate their avatars without the need of base stations or external sensors of any type. It’s also handy for things like motion capture and VTubing.

That said, Butterfly Trackers are built using the same tracking technology and the ICM-45686 IMU chip by TDK as the original, something SlimeVR notes also includes the same long drift reset times and tracking quality.

The key innovation however is the inclusion of a custom 2.4 GHz dongle instead of Wi-Fi, which essentially allows the trackers to be smaller, lighter, and have a longer battery life. SlimeVR estimates each tracker can last up to 48 hours on a single charge, which is more than double its original Full-Body Trackers.

And because they’re so thin and light, this also includes a few new methods of attachment, including directly via straps, clips, and even iron-on patches.

Notably, all SlimeVR trackers are compatible with standalone headsets, including Meta Quest, Pico, or Steam Frame, as well as any headset that uses SteamVR.

The campaign’s lowest backer tier is the ‘Core Set Bundle’, which includes six Butterfly Trackers for $279, which are estimated to ship by Aug 31st, 2026. SlimeVR says the six-unit bundle is enough to track the position and rotation of your hip, knees, and chest, as well as the position (re: not rotation) of your feet.

You can check out the full specs list and additional funding tiers over on the SlimeVR Butterfly Tracker Crowd Supply campaign, which ends March 19th.