Personalize your PulseOn Heart Rate Wrist Band with additional straps. The strap has been designed for the best comfort and fit available. It is made of high quality elastic technical material that is resistant to dirt, water and sweat and is also washable. Size small: wrist width 160mm - 190mm / 6.3 in - 7.5 in. Package includes: One changeable strap in Acid and one changeable strap in Midnight. Quick guide.