Lightweight over-the-glass unilens design fits over most Rx eyewear Adjustable Duoflex cushioned temples Made in USA The Uvex Ultra-spec line of safety glasses is designed for use by visitors and was created to give safe, economical protection at a low price. The Ultra-spec 2001 offers OTG (over the glass) which allows the glasses to be worn over perscription lenses. The lens provides excellent protection against dust, debris, and any foreign objects but is not as comfortable as other Uvex safety glasses for all day wear.