Sinn 'On the Fly' Folding Extension H-LinkYOUR BRACELET IS NEVER THE PERFECT FIT Sinn makes some of the toughest, most capable tool watches in the world but even they missed this. Add it, and its perfect. Morning: perfect. Afternoon: too tight. Evening: too loose. Heat, cold, and movement change your wrist your bracelet cant keep up. On The Fly fixes that with instant, tool free 5 mm adjustment, completely hidden under your clasp. Youll never see it, and neither will anyone else except theyll