The Amazfit Bip U is very lightweight at 31 grams, which makes it comfortable to wear during a workout and at night for sleep tracking. The main module is made of polycarbonate, and the 20mm wide detachable straps are made of silicone rubber and have an adjustable length of 76-118mm. These are quite soft and comfortable, and I didn't really face any issues with them during my 15+ hours of usage per day for a few weeks.
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Display: 1.43", 320x302 pixel TFT color screen, 2.5D Gorilla Glass 3
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Straps: Detachable silicone rubber straps, 20mm width, 76-118mm adjustable length
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Features: Real-time heart rate monitor, Blood oxygen level measurement, Stress Monitor, 5ATM water resistance, Sleep Tracking, Menstrual Cycle Tracker, Sports Tracking, Step Counter, Call and App Notification alerts, Standing Reminder, Phone Finder, Weather Forecast, Camera and Music Control, World Clock, Pomodoro Tracker
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Sports Modes: More than 60 sports modes, including Walking, Outdoor Cycling, Yoga, Pool Swimming, and Cricket
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Sensors: BioTracker 2 PPG Biological Optical Sensor, SpO2 Sensor, Accelerometer, Gyroscope
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Connectivity: BLE 5.0, Compatible with Android 5.0+ and iOS 10.0+
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Positioning: Relies on connected smartphone's GPS
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Battery: 230mAh
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Colors: Black, Pink, and Green
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Dimensions: 40.9 x 35.5 x 11.4 mm
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Weight: 31 grams