Reliable material: our straw lid is made of PP material, reliable and safe material, suitable for hot and cold drinks and will not affect the taste of beverage, durable and not easy to break. Let use the straw lid in fitness, outdoor sport, hiking, daily hydration and so on.PERFECT COMPATIBILITY: The straw lid perfect fit for hydroflask standard mouth, include 12oz, 18oz, 21oz, 24oz or most hydroflask Standard Mouth. Not for wide mouth bottle, Only for hydroflask Standard Mouth.EASY TO USE: Straw lid fits your mouth perfectly, smooth water flow, let you drink water to your heart's content from straw lid. Easy flip and sip, easily push it back and tightly close the lid. Allowing one-handed drinking for both adult and kids, meet your daily hydration needs.Easy to carry: Come with finger ring design, which provide convenient ways to carry bottle when you go out, so you can clamp the bottle during the journey, the cover is leak-proof and easy to carry, very suitable for drinking water during the journey, sports and other outdoor activities.Practical safety ring it not only add cool style also vivid identity on your bottle, also provide convenient ways to carry bottle anywhere you go.Flexible application: Straw cover is very suitable for hiking, traveling, yoga, rock climbing; flip cover is very suitable for beach, camping; elastic cap suitable for office and hiking; different types of water bottle replacement caps will meet your different needs.Material:PP+AScolour:blackPackage Contents:2 x Straw lids4 x Straws2 x Straw brushesOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.