[【100% Spill Proof】Our 30 oz insulated tumbler features an innovative straw lid that allows you to switch between enjoying your drink and sealing it by simply sliding the slider and the silicone threaded lid effectively prevents liquid leakage. 【Excellent Insulation】TILUCK water cup adopts copper plating a double-layer vacuum with remarkable insulation effect and is sweat-proof. It can keep cold for 24 hours which is very suitable for cold drink lovers and the large capacity reduces the trouble of frequent water addition. 【High-Quality Material Dishwasher-Safe】The reusable tumbler cup is made of 18/8 food-grade stainless steel material and is BPA-free the electrolytically polished interior is easy to clean and dishwasher-safe. 【Anti-Slip Bottom Base】Silicone anti-slip pad prevents shaking collision and scratches; the surface of our 30oz tumblers is wear-resistant and not easy to fall off providing a longer service life. 【Cup Holder Friendly】The base size is suitable for most cup holders whether in a relaxing moment or on the go our tumbler with handle keeps your favorite drink always within reach.]