Silicon Sport Bands | Two-ToneFor the Athlete inside you. Comfortable wearing: lightweight, waterproof, Skin friendly, Soft, and 100% breathable fluoroelastomer material keeps your wrist comfortable when wearing, you don't need to worry about skin irritation while wearing it. Pin and tuck closure breathable small holes provide easy locking and release, allowing for greater dimensional flexibility. Various straps personalize your iwatch to fit your mood and outfit in daily life.