Aura Strap
Aura Strap is in fact a smart strap that aims to greatly enhance the info your apple watch will be able to provide. To be launched in March of the present year (it´s still being tested and fine tuned), the Aura Strap is able to determine some valuable info through the electrodes present in the strap that will measure: your body composition, hydration level plus a more accurate heart rate data with fitness levels. All of this using bio impedance measurements, the brand even claims the possibility of warning the user in case of serious risk of a heart attack. So you see these two could form quite the dynamic duo, the strap is also waterproof so no worries about showering with it or taking a swim in the pool and because it uses ultrasound tech to communicate with the watch, it has a really long range of battery, up to 6 months, plus you get 4 different colors to choose from, so this is a serious upgrade to consider for your apple watch.