Main Feature: PERFECT DESIGN:Fashion design, both lightweight and durable. And a row of pressing die forming air holes, not only further reduce the weight, but also improve the permeability.brand new and high quality Silica gel materials, environmental for protection and non-toxic, feel more comfortable, perfect for sports wear.Contracted design style, with you life contracted and not simple. ADJUSTABLE SIZE:smart watch ,convenient and enjoy very much for your exercise for time With sweat grooves design, it's helpful for sports.Compression molding, sturdy and durable It is with many air holes, which will make you feel ventilate Specification: Material: Silicone Strap Length: about 230mm / 9.05inch Long belt: 102mm short belt: 95mm Compatible : For Fit JR 3/ vivofit JR3 Watch Note: Please allow 1-3mm differs due to manual measurement. Due to the different display and different light, the picture may not show the actual color of the item. Thanks for your understanding. Packing include: 1 x Band Strap For Fit JR 3/ vivofit JR3 (Tracker is not included.)