Arthro Thumbs-Up Cup With Lid. * 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 1 (2.5 cm) of free space above the liquid to reduce spillage. * Top rack dishwasher and microwave safe.