Regulates the flow of water to avoid splashing and spilling. Fits into most wide mouth bottles for spill-free drinking. Food-Grade Silicone,100% BPA & PVC FREE. It's easy to clean and does not retain weird tastes. It's also flexible yet durable and does not tear or wear easily. 2-Pack pack comes with one Blue and one yellow wide mouth water bottle splash guard Top quality,enjoy high-quality product and customer service.If there is any problem about products, we'll repair or replace the item for free. Best gifts for whole family. Preventing spills is especially helpful for families who are always on the go.Small and cute appearance keeps you happy throughout the day.