Here's the smartest school of fish you'll ever see! high wave's big fish take the guesswork (and bitterness) out of your morning Coffee equation. These personal brewing systems allow you to brew and drink, right in the same mug. Handmade from borosilicate glass, they feature a patented shut-off valve, drink-through top, and a double wall body with a single wall lip. The double-wall body adds insulation for both your brew and your hand, while the single wall lip makes for super comfortable sipping. The patented filter eliminates the contact between the water and Coffee as soon as it's pressed, and its fine mesh steel works perfectly with even the most delicate tea Leaves. That means that your last Sip of Coffee or tea, will taste as delicious as your first.