24 OZ, Travel Mug, Unbreakable Stainless Steel Exterior, Spill Resistant Slide Lock Lid, Double Wall Foam Insulation, Ergonomic Handle. Unbreakable stainless steel exterior, spill resistant slide lock lid, double wall foam insulation and ergonomic handle. Double wall foam insulation retains hot or cold temperatures Unbreakable stainless steel exterior Spill-resistant slide-lock lid Ergonomic handle Fits most automotive cup holders