I am so in love with these glasses.  Everything inside stays cold for oddly amount of time. My husband was making fun of me for being so excited about them and yesterday he told me he liked them so much i needed to buy more of them. They feel good on your lips (ergonomically) , they are 20 oz so they are not too big or too small, quality material. I will likely buy everyone a set for Xmas presents. that is how wonderful they are!