ECG-Compatible Indents: Molded with specialized side cutouts. This maintains proper skin contact so you can take electrocardiogram readings.Premium Metal Finishes: Fitted with high-end precious metals. You can choose precious metal finishes like Titanium or Gold on the hardware clasps.Performance Fabric: Woven from WHOOP's signature ultra-soft microfilament yarn. This makes the strap breathable, lightweight, and stretchable.Fast Link Slider: Built with a specialized mechanism. It hooks securely onto the device grooves for seamless band swaps.