The frame: Nathaniel Kleitman was an American physiologist and sleep researcher who served as Professor Emeritus in Physiology at the University of Chicago. He is recognized as the father of modern sleep research and is the author of the seminal 1939 book Sleep and Wakefulness. The look: Square frames in a rich tortoise shell hue with subtle curves and a clear saddle bridge. If you like glasses that wrap, this frame has you in mind. Fit: Medium - Learn Your Size Includes: 1x Nate BlueSync, 1x Nate Daylight, 1x Nate Sunset Not your style? Try Maxwell Complete Set Only available in Non-Prescription