I wore this for 2-3 triathlon races. It’s amazing, but has a large face so better for bigger wrists. Just when you thought Garmin had cornered the market on powerful, affordable, and effective wrist-mounted GPS devices, here comes the Forerunner 305. The release of this device is a major achievement from a design and technology perspective. This isn't just marketing-speak; the Forerunner 305 is the most accurate, most reliable wrist-mounted performance and GPS tracking tool we've ever tested. Yes, it's that good. While no device this compact can do everything (yet), the 305 pushes the boundaries of what is possible from something strapped around your wrist.Train indoors and still track your distance, pace and calories burned with the optional foot pod. This wireless sensor attaches to your running shoe and transmits distance and pace data to your Forerunner 305 so you can still use it when GPS reception is unavailable. Features & details High-Sensitivity, Watch-Like GPS Receiver That Provides Exceptional Signal Reception 1 Piece Training Assistant That Provides Athletes With Precise Speed, Distance & Pace Data Includes Training Center Software, Which Allows Users To Download Workout Data For A Detailed Analysis Used For Multiple Sports Such As Cycling, Cross- Country Skiing & Windsurfing Data Acquired May Also Be Analyzed With Motionbased, Which Provides Online Mapping & Route Sharing