Whoop has introduced its next generation of its proprietary technology: Whoop 4.0, which is 33% smaller than its predecessor.

The new technology contains an upgraded sensor configuration designed for optimal accuracy and includes Whoop Body featuring Any-Wear Technology, a first-of-its-kind line of smart apparel which enables members to wear their Whoop 4.0 on multiple locations across the body.

On the next-gen Whoop 4.0, Will Ahmed, Whoop Founder & CEO, stated

“I’ve been thinking about this technology for more than a decade, and I can promise you that this is the most innovative product we have ever released. We’ve always aspired to develop wearable technology that is either cool or invisible. With the launch of Whoop 4.0 and Whoop Body, we have accomplished both.”

Here’s a rundown of all the new features Whoop wearers can look forward to with the latest edition:

• Upgraded Sensor Configuration: The active sensor area now contains 5 LEDs (three green, one red, and one infrared), 4 photodiodes, and advanced algorithms to provide even more accurate heart rate measurements
• 33% Smaller Size: Whoop 4.0 is 33% smaller than Whoop 3.0 with a five-day battery life
• New Feature – Sleep Coach with Haptic Alerts: Whoop 4.0 is engineered with haptic alerts that members can set to wake them up through gentle vibrations at the optimal time based on their sleep needs and cycles
• New Feature – Pulse Oximeter: The upgraded hardware is equipped to calculate blood oxygen levels (SPO2) to help members unlock additional daily health insights
• New Feature – Skin Temperature Sensor: Whoop 4.0 measures skin temperature to provide members another layer of knowledge about their bodies
• New Feature – Health Monitor: Members can track live heart rate, skin temperature, blood oxygen saturation, resting heart rate, heart rate variability, and respiratory rate in one view. The Health Monitor also allows members to easily download and export 30-day or 180-day trends of these metrics into a report that can be shared with a coach, trainer, PT, or physician
• Whoop Battery Pack 4.0: The upgraded battery pack built for on-the-go charging is now waterproof and lets members double tap to view battery level
• Next Generation Battery Technology: Whoop 4.0 is the first product in the world powered with Sila’s silicon anode battery materials. Engineered with cell configuration improvements and long cycle life, the new battery delivers 17% higher energy density than WHOOP 3.0, facilitating a reimagined industrial design that also unlocks Whoop Body

Whoop Body featuring Any-Wear Technology enables Whoop 4.0 to collect accurate data from areas including the torso, waist, and calf as well as the wrist.

Whoop Body comes in two collections with prices ranging from $54 to $109 and is only available in combination with Whoop 4.0 at Whoop.com.