Erin Timminswrote a review of SmartWool PhD Run Ultra Light Micro Sock on September 21, 2017
Familiarity: I've used it several times
Huge fan of SmartWools socks, so decided to check out the Ultra Lights. Like all SmartWool socks, this sock is extremely comfortable and super soft. The material is light, so your feet stay cool even through several hours of activity. Compared to the Run Light Elite, the Ultra Lights are noticeable thinner, so I do worry about the durability of the sock in the long haul. This might be my go to 'casual sock' as opposed to 'active sock'. Overall, solid sock, but I might suggest the Light if you plan on using the sock while being active.