Functional and lightweight for people who have decreased grip strength wrist pain hand deformities or need to keep the wrist in a neutral position *The unique ergonomic design increases leverage of the hand and aids in raising the cup to the lips without wrist motion *The thumbs-on grip reduces the possibility of spilling due to trembling *The cup is double-walled to protect hands from heat or cold *It holds 8 ounces (237 ml) leaving 1ù (2.5 cm) of free space above the liquid to reduce spillage. Top rack dishwasher and microwave safe *cup dimensions