ACTIVE WATCH BAND: The Extreme Sport Band gives you a firm grip and versatile usability for the active lifestyles; Comes with quick-release spring bars for easy changes LET YOUR WRIST BREATHE: Wristband is built to withstand activities you enjoy, and perforations throughout the band provide extra breathability WITHSTANDS THE ELEMENTS: The Watch4 Extreme Sport Band is built with durable fluoroelastomer materials that keep your smart watch tightly on your wrist, even in situations faced with varying temperatures and weather CHOOSE YOUR COLOR: The band comes in 4 stylish combinations of colors and two sizes to fit men and women COMPATIBILITY: This band is designed for Samsung Galaxy Watch4 series and later models that fit 20mm straps; Galaxy Watch 4 sold separately