Runners’ wrists come in all sizes. There are the teeny ones belonging to some of my speedy running friends and there are the beefy ones belonging to powerhouse runners and triathletes. And there’s everything in between. To fit your wrist to a T, the new Forerunner 405CX comes with multiple band options, including the standard vinyl wristband and adjustable fabric straps in two lengths. The 405CX model differs from the 405 in that it offers heart rate-based calorie calculations. If you already have a Forerunner 405 and you like the idea of size options, check out the wrist strap accessory kit, which includes the adjustable straps. For help in changing out the band on either the 405 or 405CX, take a look at this video where a Garmin engineer and Jake step you through the process. It takes a bit of a steady hand to work in those pins, so don’t try to tackle the task after a double espresso. Oh, and beware of shag carpets. If one of those pins takes a flying leap, you’ll still be combing the carpet when you running partner shows up for your next workout. For more short training videos with Jake and the Forerunner 405, check out our Learning Center.