This is a really comprehensive UI kit from the good guys at Invision.
Comprised of 8 source files, 138 templates and over 250 UI elements, this kit enables you to mockup and prototype a mobile app in no time. There are a range of elements for Ecommerce, social, messaging, multimedia apps and more. If used with the InVision app you can also create interactive prototypes.
Tethr is available for both Photoshop and Sketch, hit the button below to get this UI kit now.