Do these have spring hinges? If not, how have you found the fit? I've worn frames that do not have spring hinges, but they were straight temples (not curved like these) and it eventually hurt the sides of my head because there was too much pressure.

Tech Specs:

Frame:

O Matter 

Hinge Type:

Metal 

Lens:

Plutonite 

Interchangeable Lens:

No 

Polarized:

No 

Face Size:

Women only 

Case Type:

Hard case and cloth cleaning sack 

Nose Pads:

No 

Arm Pads:

No 

Warranty:

1 Year 

Recommended Use:

Casual, driving, hiking, camping 

Country of Origin:

United States