Fits your face very well, using extendable temple and ear posts. These goggles have wrap-around side eye protection and UV protective lenses. The BEST thing about these glasses -- they are bi-focals! We have five different prescriptions. See better AND get better protection during your woodworking. No more fumbling with your glasses underneath your eye protection. It's all in one! Click over to "Neat Supplies" to find your bi-focal prescription. We have 1.0, 1.5, 2.0, 2.5, and 3.0. Great idea for better woodworking. These are 3.0 prescription glasses.