Safe Material, Eco-FriendlyThe collapsible travel mug is made of food grade silicone material with stainless steel rim and plastic lid. Easy to wash, odorless, non-staining, durable, flexible and reusable.^ Ultra-thin folding design and portableUpdate the foldable design, save space and only 0.59 inch when folded, fits well in your pocket, purse, backpack, suitcase and doesn't take up space, ideal for outdoor hiking, camping, travel and sporting events .^ Excellent performanceCan be hung on the pocket of a connection hand rope and a portable hook. Easy to read with the measure in the cup. Much easier to hold and drink from the stainless steel rim of the cup. A tight fit of the lid prevents dust and dirt from getting close.^ Size informationThe capacity is 270ml. Before folding, the top diameter is 3.74 inches, the bottom diameter is 1.77 inches, and the height is 3.55 inches. After folding, the height is only 0.59in, temperature range from -40F to 480F. The small foldable volume and light weight made them both for home and outdoor use.