Constructed with durable stainless steel, Kevin's Custom Yeti Ramblers provide optimal double-wall vacuum insulation to protect beverages. Plus, the MagSlider™ lid adds an extra layer of protection, although not leakproof. The tumblers are fingerprint-proof, resistant to UV rays, and dishwasher safe, and come in Stainless, Duracoat™ colors, and Seasonal finishes. Robust, insulated, and prepared for any adventure.