Libbey 15232 DuraTuff Gibraltar Tumbler Glass

DuraTuff is a specialized thermal process Libbey uses to strengthen the upper portion of the glass. It significantly increases resistance to both mechanical and thermal shock, making the glass much less likely to chip or break during the rigors of daily service.

While the DuraTuff treatment offers improved thermal shock resistance, this is a single-wall glass designed primarily for cold spirits, cocktails, and water. It is not intended for boiling liquids or high-heat applications.

The paneled exterior provides a tactile, textured surface that makes the glass easier to hold, even when condensation forms on the outside. It offers a more secure grip than a smooth-sided tumbler.

These glasses are not designed for stacking. The base and rim geometry do not support a stable stack, so they should be stored upright on shelves or in glass racks.

The thick sham provides a low center of gravity, which makes the glass feel balanced and stable rather than top-heavy. While it adds a substantial feel in the hand, it is designed to be comfortable for standard service.