Spill Proof Insulated Stainless Steel Tumbler with Straw lets children as young as 3 sip out of a cup just like the big kids. No need to worry about messy spills thanks to a leak-proof silicone seal around the straw opening and a spill-proof valve on the inside. For good measure, engineers added a soft-grip pad under the tumbler to minimize skids and tipping. The Thermalock dual-wall vacuum insulation keeps drinks cold for up to 10 hours and helps prevent condensation, even after hours of fun at the playground. This tumbler also fits most car cup holders to make road trips a breeze. Rest assured, all materials are 100% BPA-free. At the end of a long day, you'll be happy to know that the body, lid, and straw are dishwasher safe on the top rack and the straw twists apart for easy cleaning.