Watches used for various outdoor activities need to have bands that can adjust large enough to go over sleeves and gloves in winter. With winter garments, it's difficult to see a watch covered up. I've done this myself while skiing, backpacking, jogging, etc. Either over the sleeve or over the glove if it's long. You'll lose the HRM if you do this, but if that's important you can wear a Polar Bluetooth strap for like $60. You'll also lose Apple Pay, but who cares. Scuba divers do this over their wet suits, but we won't see the Apple Watch used for diving for several years.