●A size that fits most people: Watch strap for MorePro HM18 Fitness Tracker and fits "4.33-8.66" wrists for majority persons. ●Comfortable to wear: Made by Environmentally Friendly TPU material, Portable, Sweat, water resistant & Breathable ●Easy to assemble and remove: Adjustable watch band for different type wrists, easily take off and install, no tools needed. ●No worry about falling off: Metal adjustable clasp and loop holder designed, holds your wrist band in a suitable place and wont fall off. ●Optional colors: 3 colors for your choices, personalize your smart band to fit different outfits in daily life.