The Topeak Panobike Strap Extension is ideal for if you need that bit of extra lee way on your Topeak Panobike Heart Rate Monitor strap. The extension gives you an extra 25cm in length just ensure that the fit is comfortable all day long in the saddle. To increase the length of your original chest strap you just need to attach the extension to your original Topeak Panobike Strap. The Topeak Panobike Strap Extension is a brilliant add on accessory by Topeak. Topeak Panobike Strap Extension Features Increase length of original chest strap Strap Extension 25cm " More info