Our 100% Silicon Glasses Are Made of Bpa-free Silicon, Which is Both Heat & Freeze Resistant. Wide Base Provides Stability, Thicker Thickness & Long Service Life. the Flexibility of the Product is Good, Not Easy to Change the Shape, Very Firm. Easy to Carry, Easy to Clean, Always Bright. High & Low Temperature Resistance, Up to 230 Degrees, the Lowest Can Also Reach -40 Degrees. Both Hot & Cold Drink Can be Used. It Can be Washed in the Dishwasher, But Can Also be Easily Washed by Hand. Our Pint-sized Silicon Cup Are Portable Enough to Use While Camping or Performing Other Outdoor Activities, & They Also Make Perfect Travel Cup for Your Daily Commute.