SPILL PROOF STRONG CONSTRUCTION: Spillproof tumbler lid designed with a unique vacuum sealed technology thats airtight keeps your drink insulated longer; No more worry about spill especially when carrying a hot beverage in the bag or driving. MAKE DRINKING EASIER: Drink directly or sip through the hole with a straw; the locking latch could fold flat back so that will not hitting your nose when you drink directly, provide you with a comfortable experience. BPA FREE & DISHWASHER SAFE: Transparent tumbler lids are BPA free, non toxic materials and dishwasher safe (the lids can be divided into many parts for cleaning) ALL PURPOSE: These spill proof lids are perfect fit for most any kind of 30 Oz insulated tumblers varying from Yeti, Rambler, RTIC, Ozark Trail, SIC, Smart, so its time to make a perfect gift for your tumbler ONE SET SHARE USE: Just buy one Set of 4 tumbler lids that you can share with your family, friends or colleagues.