Fastrack Black Sunglasses for Men and Women Computer Eyeglasses Online They do not have spring

They do not have spring hinges but the arms are very flexible so they have a similar comfort fit to spring hinges

Model 9302 805 Series uvex ultrasonic planet Lens Material Polycarbonate (PC) Lens Thickness 2

providing maximum comfort and stability

-          Includes an elastic band for better fit

BLUELIGHT BLOCKER&REPLACEABLE LENS – Reduce symptoms of eyestrain during prolonged computer exposure

Fastrack Black Sunglasses for Men and Women Computer Eyeglasses Online They do not have springFastrack Black Sunglasses for Men and Women Size Map: Small ; Lens Material: Polycarbonate ; Front Material Detail: Plastic ; 17 mm Bridge Width Frame size: Lens Length = 16 cm,Width = 8. 1 cm,Height = 5. 6 cm ; Temple Design: Regular ; Lens Height Description: Narrow 100% UV protected Black colored frame with Shiny Black temple