SWAP IN SECONDS: Swap daily to compliment your wardrobe or mix and match with BARTON’s leather & silicone quick release bands to take your timepiece from the workplace to the gym. Simply slide quick release knob with finger as shown in diagram. | SELECT PROPER WIDTH: Compatible with any traditional or smart watch that uses 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, or 24mm spring bars. Quick release spring bars are included with and integrated into the band, so it is important that your watch's lug width matches exactly. Measure width where band meets the watch casing. You can also find the specifications for most watches by searching online. | SMART WATCH WIDTHS: 'Product Description' section on this page lists proper widths for Men's & Women's Smart Watches | PREMIUM MATERIALS: Cotton canvas is durable, soft, breathable & machine washable with embroidery added for strength & style. 316L surgical grade stainless steel buckle with solid tongue. | OPTIMAL FIT: Approximately 8" total length when not attached to watch; Designed to fit wrists 5.75" to 8", but watch geometry also impacts fit.