20 oz Skinny Tumbler Double-Wall Vacuum insulated thermal design is good for keeping your drinks warm or cold for a longer time, so you can use it in any season. Tumbler comes with a push-on Tritan lid to keep any dust particles getting in and stop major spills. Tumbler is made of 304 stainless steel, .more durable than other ordinary plastic; silicone base added to keep it from sliding on slippery surfaces and reduce the noise. Straw included. 20 oz Dual Drinking Versatile Lid With Dual Drinking Options: tumbler is designed with dual opening ways for drinking, providing you with versatile options for sipping. You can sip directly like a coffee bottle or use it as a spill-resistant sippy cup for on-the-go hydration. Premium Quality: triple-insulated stainless steel for durability, corrosion resistance, and temperature maintain for both hot and cold drinks.