The Plasfun First, new entry-level glasses from YY Vertical, are designed for all climbers wanting to protect their necks without breaking the bank! Plasfun First glasses give the belayer: comfort, less neck pain and at the same time a good overview of the climber's activity. This is a basic model at an affordable price. Ideal for casual use. The YY Vertical brand is a time-tested and popular manufacturer of belay glasses. They have good optics and comfortable frame construction.