No Spill 360 Weighted straw allows spill-proof drinking at any angle, including upright The innovative weighted straw moves to the liquid whenever the cup is tilted allowing your child to drink to the last drop Transparent base to allow Parents to see how much liquid has been consumed - made of strong, durable, & crystal clear tritan from eastman. Flip-it top keeps straw clean when not it use/ The straw dispenses a variety of liquids ranging in consistency from juices to milk to water