[Applicable models]: The replacement bracelet is only applicable to Fitbit Charge 4 / Charge 3 / Charge 3 SE, please note that Charge 4 or Charge 3 watches are not included.^ [High-quality soft silicone material]: The vent holes on the strap make your skin feel breathable and comfortable. Comfortable wearing experience allows you to better enjoy life and have a longer service life. Avoid skin allergies.^ [Easy installation]: The buckle design prevents the watch from falling easily. Suitable for many occasions: swimming, party, work, running, sports. The best gift for family, friends and couples on any occasion.^ [Two sizes]: The size can be adjusted flexibly. Small size fits 5.5"-7.1" (140mm-180mm) wrist circumference. The large size fits 7.1" -8.7" (180mm-220mm) wrist circumference.^ [100% Satisfaction Guarantee]: Provide you with a 100% satisfaction guarantee. If you have any questions, please feel free to contact us.