Must have Marathon gear?
Im slowly replacing my M frame with Radar, and you guys were one of the first companies to carry replacement lens! I got my fav VR28. If it get dirty, just wipe on the shirt (I dont use cotton shirt, my wicking ones ), and the lens looks as new. That ease of maintenance is nothing compare to M frame, which usually end up on my head after mile 13 on marathon. Highly recommended!