Sleek and modern, this Philip Stein Slim Sleep Bracelet® is fitted with an ultra-soft microfiber band, perforated to let the skin breathe at night. A glass window in the stainless steel case offers a glimpse at the Natural Frequency Technology® disc housed within, which is clinically proven to improve your sleep and overall wellness. The extra long Philip Stein black strap is 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. Designed to help wearers sleep well and wake up with more energy to seize the day, Philip Stein Sleep Bracelets use Natural Frequency Technology® to better tune your body to natural energy associated with sleep and restfulness.