Sure, the lids on the Rambler Tumblers are shatterproof and dishwasher safe. But you still might need a replacement lid if you happen to misplace yours while in the field or accidentally drop it down a volcano. You know, your everyday lid mishaps. But don't worry: just like your original Rambler Tumbler lid, the replacement lids are splash resistant, easy to clean and completely clear so that you can assess your refill needs at a glance. Dishwasher safe. Fits 20oz Rambler and LowBall.