Do what they are Intended for.
I love these tumblers and they keep my drinks cold all day. My best friend and I started nursing school together so I got us both one..the straw that came with mine im not a fan of. and the color of the stethoscope and my name I wish was a little brighter and not done in silver on the purpl/sparkled cup.. but i love my friends mint colored one including the straw that came with hers.
Rating: 4 stars