Vacuum insulated: Double wall vacuum insulated to maintain temperature Hot/Cold: The Horizon 24oz Tall Straw Mug keeps drinks cold for 19 hours and hot for 8 hours. Spill-Resistant: Built with a splash-proof rubberized straw seal lid. Stays Put No Matter What: The non-slip silicone base provides a surefire grip on nearly any surface. Cup Holder Compatible: Travel-ready and made for life on-the-move.