The Stretch ID is now available in Size Packs that contain three sizes to ensure a proper fit.KidsXS, SM, MED bands includedFits wrists smaller than 6.7" (155mm)The Rugged Faceplate is highly recommended for kids.WomenSM, MED, LG bands includedFits wrists 5.5" - 7.25" (140mm - 185mm)MenMED, LG, XL bands includedFits wrists 6.1" - 8" (155mm - 203mm)