Small Press-In Straw Lid fits Hydro Flask 6 oz Mug, 10 oz Wine Tumbler, 12 oz All Around Tumbler, 12 oz Cooler Cup, 16 oz Cooler Cup, and Tandem Cooler Cup Honeycomb Insulated lid for maximum temperature retention Easy press-in fit for splash-proof dependability Easy removal tab Flexible straw is durable and easy to clean Straw is easy to trim to fit your favorite Hydro Flask drinkware BPA-Free & Toxin-Free Dishwasher safe 2.9 in Hydro Flask Closeable Press-In Lids slide shut to tame splashes and trap temps, then slide open wide enough for easy drinking and reusable straws. Sip, slide and go.