The Suncovers Fitover Sunglasses 08535 KIH Y2 Black Grey Polarized are designed to fit over your prescription glasses to give you glare free vision with Polaroid's polarized lenses that also give 100% UV 400 protection against UVA, UVB and UVC. These feature a side window for extended peripheral views which also gives good side protection and they also have a retaining strap.