The 10 oz. Rambler Jr. Tumbler is a mini powerhouse. Designed to go as far as it s taken, this ultra-durable tumbler is made with puncture-resistant 18/8 stainless steel, which means it s always ready for rough-out-of-housing. Like all of Yeti's Rambler Drinkware, this thing comes equipped with double-wall vacuum insulation, keeping drinks at ice-cold temperatures even when games of freeze tag go long. Plus, their splash-resistant Rambler Silicone Straw Lid comes with a molded-in stopper to securely hold your kid s silicone straw in place, letting you rest assured that what they re sipping stays in their cup and off their shirt. Product Features 10oz Cup Splash-resistant silicone straw and lid Fits in most car seat cup holders 18/8 stainless steel Double-wall vacuum insulation Dishwasher safe Note: For ages 3+, do not use the Rambler Silicone Straw Lid with hot, carbonated, or pulpy beverages or for storage of food or perishables.