Clarity Cup ZDK

Leak-Proof 360° Lid: Drink from any angle without spills
Clear Glass Construction: See your beverage and preserve its taste
Silicone Sleeve: Comfortable and soft grip
Silicone Base: Quiet, non-slip set down that protects your vessel
Internal Threading: First-of-its-kind internal threading design creates a smooth, sleek exterior

Ref ZDK.