Designed for performance, S'well thermo bottles will keep cold drinks cold for 24 hours and hot ones hot for 12 - and they look great while they do it. Coated twice with a sleek, semi-matte gloss finish. Water won't bead on outside: hands, bags and papers stay dry. Mouth is wide enough for ice cubes and drip-free sipping. 29.5cm x 7.5cm base diameter. Material: 18/8 double-walled stainless steel, non-toxic, non-leaching and BPA free.