These glasses are great!! They are heavy duty Acrylic, not just a thin cheap plastic material. I purchased the clear ones and they look better than I was expecting. Best of all ... no condensation ("sweating") on the exterior when filled with an ice cold drink ... so there is little to no chance of getting those unsightly water rings on your wooden furniture, or a moppy mess of water on glass table tops! But we still set them on a coaster in case of drips. Highly recommend!!!