A macho 70's classic transported to today. Large lens surface makes puts the SA58 on your face. The counterweight does it's job and keeps this big guy comfortable. 
Semi rimless means half as heavy in the front. Fully adjustable nose pads grip the frame to your face. Flex Beta Titanium temples add comfort while reducing weight. 
Counterweights crafted from original .357 cartridges and solid sterling silver for balance and comfort.
Prescription ready, just take these to your optician. 
Counterweight: 5.6g
Frame front: 5.8g