The Polar Crystal Loop is an activity tracker that is also trying to be an elegant piece of jewellery. In my humble option it looks tacky, its silicone wristband has been adorned with delicate Swarovski crystals which clash with the thick strap, it looks tacky and half hearted, aesthetics aside this doesn’t have as much to offer as the A360. You need the Polar H7 heart rate monitor to use the Energy Training, Training Benefit and Heart Rate During Training features but you do get the sleep tracking feature.