Minimum assembly is required.

These face shields are compatible with wearing glasses as these face shields will fit over the glasses. One Costco clerk (who wears glasses at check-out counter) was nice enough to answer questions.

These are re-usable. You need to clean and sanitize after each use.

Please also wear a face mask when wearing a face-shield. Face-shield is a barrier against liquids but you still need to protect yourself from aerosols.