![XL Black Micro-Fiber Sleep Strap - Model 4-MFBXL - Philip Stein Strap](http://philipstein.com/cdn/shop/products/xl-black-micro-fiber-sleep-strap-model-4-mfbxl-104537.png?v=1632150310&width=1000)
XL Black Micro-Fiber Sleep Strap - Model 4-MFBXL
Technical Data
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Water Resistant :
This extra long Philip Stein strap comes in black, the perfect accent to any look. Made of ultra soft micro-fiber, it's one of the most comfortable straps you can pair with your Philip Stein sleep bracelet.
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![XL Black Micro-Fiber Sleep Strap - Model 4-MFBXL - Philip Stein Strap](http://philipstein.com/cdn/shop/products/xl-black-micro-fiber-sleep-strap-model-4-mfbxl-104537.png?v=1632150310&width=1000)
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Natural Frequency Technology
Reduce Your Stress Levels
Philip Stein's innovative technology, seamlessly embedded within all our products, creates a harmonious connection with the body, channeling beneficial frequencies that enhance our biomagnetic field. This unique integration effectively reduces stress, promotes restful sleep, and revitalizes energy levels.
![](http://philipstein.com/cdn/shop/files/backcase_a9eb7dd4-af07-43f1-b3a7-dc9cd9ea8335.png?v=1718130450&width=1000)
Clinical Studies
The latest study on the benefits of our unique watches was published in the international, independent, and peer-reviewed journal Brain and Behavior.
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