The ESPRIT bottle has a wide mouth, making it easy to fill and clean. The bottle nipple features a patented air system that prevents the baby from swallowing air, thereby preventing colic. The nipple curvature mimics a natural breast shape, making it easier to switch from breast to bottle feeding. The nipple is made of high quality Ultra Soft Medical Grade Silicone that retains its shape, does degrade, and is easy to keep clean. ESPRIT comes with a nipple in size M. Teats with other hole sizes may be purchased. Both bottle and cap have a visible scale making it easy for you to measure the right amount. The cap can then be used as a measuring scoop and, when attached, provides a leakproof lid. The bottle has an ergonomic design that makes it easy to grip - both for you and your baby.