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 cup Dimensions