The Yeti Coolers Rambler 30 Lid features Tritan copolyester and silicone construction. The YETI Rambler 30 Replacement Lid provides durability and offers a clear design. Sure, the lids on the Yeti 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.