Test Lab

The most noticeable change that comes with warmer weather—at least for those of us who spend most of the day behind a desk—is the annoying condensation that forms on our omnipresent glass of Diet Coke (or gin, depending on the time of day) which results in a small puddle and tiny drips all over our keyboard. That is, until we were turned on to the amazing insulating powers of Tervis tumblers. American List approved and guaranteed for life, the ultrasonically-sealed, double-walled acrylic tumblers have been keeping drinks safe from sweat for more than 60 years. This was the easiest Test Lab we've ever done. The glasses work just as advertised, keeping our drinks cold and our desks dry. $11 each, at Tervis

• The polycarbonate material used in the glasses is the same used for bulletproof shields.