The Hydro Flask Straw Lid boasts a high-flow rate to quench thirst, and durability to withstand the most tenacious teeth. It???s top-rack dishwasher safe and has a convenient finger loop so you can clip your bottle when you???re on the go ?? Patent-pending design Durable rubber straw with high flow rate Made of durable polypropylene PP#5 BPA-free Compatible with all newer styles of wide mouth bottles Lifetime Warranty