allow for the addition of ice cubes, and two removable silicone elements: a grip around the body of the bottle and a base stand with shock-absorbing strips. These elements protect the fingers and prevent the bottle from breaking by being knocked or set down too heavily. The two separate glass walls provide optimal insulation, so cold drinks stay cool (for up to two hours) and hot drinks stay pleasantly warm (for up to one hour). The bottle can be comfortably handled even when it contains hot drinks and the outer wall does not build up condensation when it contains cold ones. The liquid only comes into contact with glass and stainless steel so its flavor remains unaffected. All the materials used for the bottle are BPA and BPS free. Design Each year, new designs of the Sigg bottle are added to the collection while others are no longer produced. The design of Sigg bottle has led to its addition to the permanent design collection of the New York Museum of Modern Art. The classic bottle is of a single colour (most often red) whilst more modern bottles can have designs on them and are available in both glossy or matte finishes. References External links Manufacturing companies of Switzerland Bottles