I tried the silicone ones Muscles (got them as a gift last year) but didn't really like them. They are used for juice now! Now and again the silicone needs to come off because stuff starts growing under the silicone! 🙁 I did get a few dual wall glasses for Christmas too, some small ones for me, and big ones for the Mrs Chai lattes. Also bought 2 piccolo glasses from Clandestino Roasters yesterday too! Very nice and the coffee there, excellent as usual.